Heading 2922
HTS code 2922 — Oxygen-function amino-compounds
- Chapter
- 29 — Organic chemicals
- Tariff lines
- 70
- General duty
- General duty rates from 3.7% to 6.5%, with 15 duty-free lines
Tariff lines under heading 2922
Full 10-digit codes with their general (MFN) duty rates. The correct line depends on the product's material, construction, and use.
| HTS code | Description | General rate | Unit |
|---|---|---|---|
| 2922.11.0000 | Monoethanolamine and its salts (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof) | 6.5% | kg |
| 2922.12.0001 | Diethanolamine and its salts (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof) | 6.5% | kg |
| 2922.14.0000 | Dextropropoxyphene (INN) and its salts (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof) | Free | kg |
| 2922.15.0000 | Triethanolamine (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof) | 6.5% | kg |
| 2922.16.0000 | Diethylammonium perfluorooctane sulfonate (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof) | 6.5% | kg |
| 2922.17.0000 | Methyldiethanolamine and ethyldiethanolamine (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof) | 6.5% | kg |
| 2922.18.0000 | 2-(N,N-Diisopropylamino)ethanol (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof) | 6.5% | kg |
| 2922.19.0900 | Drugs (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Aromatic) | 6.5% | kg |
| 2922.19.2000 | 4,4'-Bis(dimethylamino) benzhydrol (Michler's hydrol); 5'-[3'-(Dimethylamino) propyl]-10',11'- dihydro-5H'-dibenzo [a,b] cyclohept- en-5'-ol (Dibenzcarbinol); and 1-(p-Nitrophenyl)-2-amino-1,3- propanediol (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Aromatic > Other) | 5.8% | kg |
| 2922.19.3300 | N1-(2-Hydroxyethyl)-2-nitro-1,4- phenylenediamine;N1,N4,N4- Tris(2-hydroxyethyl)-2- nitro-1,4- phenylenediamine;N1,N4-Dimethyl-N1- (2-hydroxyethyl)-3-nitro-1,4- phenylene- diamine;N1,N4-Dimethyl-N1-(2,3-dihydroxy- propyl)-3-nitro-1,4- phenylenediamine; andN1-(2-Hydroxyethyl)-3-nitro-1,4- phenylenediamine (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Aromatic > Other) | Free | kg |
| 2922.19.6000 | Products described in additional U.S. note 3 to section VI (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Aromatic > Other > Other) | 6.5% | kg |
| 2922.19.7000 | Other (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Aromatic > Other > Other) | 6.5% | kg |
| 2922.19.9000 | Salts of triethanolamine (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Other) | 6.5% | kg |
| 2922.19.9610 | N,N-Dimethyl-2-aminoethanol, N,N-diethyl-2-aminoethanol and their protonated salts (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Other > Other > N,N-(Dialkyl (methyl, ethyl, n-propyl or isopropyl)-2-aminoethanols and their protonated salts) | 6.5% | kg |
| 2922.19.9619 | Other (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Other > Other > N,N-(Dialkyl (methyl, ethyl, n-propyl or isopropyl)-2-aminoethanols and their protonated salts) | 6.5% | kg |
| 2922.19.9690 | Other (Oxygen-function amino-compounds > Amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Other > Other) | 6.5% | kg |
| 2922.21.1000 | 1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid (Chicago acid); 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, potassium salt; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, sodium salt; 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, monosodium salt (H acid, monosodium salt); 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, potassium salt (H acid, monopotassium salt); 4-Amino-3-hydroxy-1-naphthalenesulfonic acid; 6-Amino-1-naphthol-3-sulfonic acid and its salts; and 8-Amino-1-naphthol-5-sulfonic acid and its salts (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Aminohydroxynaphthalenesulfonic acids and their salts) | 5.8% | kg |
| 2922.21.2500 | 1-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium salt (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Aminohydroxynaphthalenesulfonic acids and their salts) | Free | kg |
| 2922.21.4000 | Products described in additional U.S. note 3 to section VI (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Aminohydroxynaphthalenesulfonic acids and their salts > Other) | 6.5% | kg |
| 2922.21.5000 | Other (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Aminohydroxynaphthalenesulfonic acids and their salts > Other) | 6.5% | kg |
| 2922.29.0300 | o-Anisidine;p-Anisidine; andp-Phenetidine (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other) | 6.5% | kg |
| 2922.29.0600 | Fast color bases (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > m-Nitro-p-anisidine; and m-Nitro-o-anisidine) | Free | kg |
| 2922.29.0800 | Other (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > m-Nitro-p-anisidine; and m-Nitro-o-anisidine) | Free | kg |
| 2922.29.1000 | 2-Amino-6-chloro-4-nitrophenol; 2-Amino-4-chlorophenol; 2-Amino-4-chlorophenol hydrochloride; 2-Amino-p-cresol; 4-Amino-o-cresol; 6-Amino-2,4-dichloro-3-methylphenol; 2-(3-Amino-4-hydroxyphenylsulfonyl)ethanol; 2-Amino-4-nitrophenol; 2-Amino-4-nitrophenol, sodium salt; 2-Amino-5-nitrophenol;m-Aminophenol; 2-(4'-Aminophenoxy)ethylsulfate; 5-Chloro-2-(2',4'-dichlorophenoxy)aniline; 3,4-Dimethoxyphenethylamine (Homoveratrylamine); 2-Hydroxy-5-nitrometanilic acid; 4-Methoxymetanilic acid; 6-Methoxymetanilic acid; 4-Methoxy-m-phenylenediamine; 5-Methoxy-m-phenylenediamine sulfate; 6-(Methylamino)-1-naphthol-3-sulfonic acid; 7-(Methylamino)-1-naphthol-3-sulfonic acid; and 2-Methyl-p-anisidine (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other) | 5.8% | kg |
| 2922.29.1300 | o-Aminophenol; and 2,2-Bis[4-(4-aminophenoxy)phenyl]propane (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other) | Free | kg |
| 2922.29.1500 | m-Diethylaminophenol;m-Dimethylaminophenol; 3-Ethylamino-p-cresol; and 5-Methoxy-m-phenylenediamine (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other) | 6.5% | kg |
| 2922.29.2000 | 4-Chloro-2,5-dimethoxyaniline; and 2,4-Dimethoxyaniline (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other) | Free | kg |
| 2922.29.2600 | Fast color bases (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Other) | 6.5% | kg |
| 2922.29.2700 | Drugs (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Other) | 6.5% | kg |
| 2922.29.2900 | Photographic chemicals (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Other) | 6.5% | kg |
| 2922.29.6100 | Products described in additional U.S. note 3 to section VI (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Other > Other) | 6.5% | kg |
| 2922.29.8110 | p-Nitro-o-anisidine (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Other > Other > Other) | 6.5% | kg |
| 2922.29.8190 | Other (Oxygen-function amino-compounds > Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof > Other > Other > Other > Other) | 6.5% | kg |
| 2922.31.0000 | Amfepramone (INN), methadone (INN) and normethadone (INN); salts thereof (Oxygen-function amino-compounds > Amino-aldehydes, amino-ketones and amino-quinones, other than those containing more than one kind of oxygen function; salts thereof) | Free | kg |
| 2922.39.0500 | 1-Amino-2,4-dibromoanthraquinone; and 2-Amino-5-chlorobenzophenone (Oxygen-function amino-compounds > Amino-aldehydes, amino-ketones and amino-quinones, other than those containing more than one kind of oxygen function; salts thereof > Other > Aromatic) | Free | kg |
| 2922.39.1000 | 2'-Amino aceto phenone; 3'-Amino aceto phenone; 1-Amino-4-bromo-2-methyl anthra quinone; 1,4-Bis [1-anthra quinonyl amino] anthra- quinone; 1,4-Di mesi dino anthra quinone; 4-Dimethyl amino benzaldehyde; and Imino di anthra quinone (Oxygen-function amino-compounds > Amino-aldehydes, amino-ketones and amino-quinones, other than those containing more than one kind of oxygen function; salts thereof > Other > Aromatic) | 5.8% | kg |
| 2922.39.1400 | 2-Aminoanthraquinone (Oxygen-function amino-compounds > Amino-aldehydes, amino-ketones and amino-quinones, other than those containing more than one kind of oxygen function; salts thereof > Other > Aromatic) | 6.5% | kg |
| 2922.39.1700 | 1-Aminoanthraquinone (Oxygen-function amino-compounds > Amino-aldehydes, amino-ketones and amino-quinones, other than those containing more than one kind of oxygen function; salts thereof > Other > Aromatic) | Free | kg |
| 2922.39.2500 | Products described in additional U.S. note 3 to section VI (Oxygen-function amino-compounds > Amino-aldehydes, amino-ketones and amino-quinones, other than those containing more than one kind of oxygen function; salts thereof > Other > Aromatic > Other) | 6.5% | kg |
| 2922.39.4500 | Other (Oxygen-function amino-compounds > Amino-aldehydes, amino-ketones and amino-quinones, other than those containing more than one kind of oxygen function; salts thereof > Other > Aromatic > Other) | 6.5% | kg |
| 2922.39.5000 | Other (Oxygen-function amino-compounds > Amino-aldehydes, amino-ketones and amino-quinones, other than those containing more than one kind of oxygen function; salts thereof > Other) | 6.5% | kg |
| 2922.41.0010 | Meeting requirements of Food Chemical Codex, Codex Alimentarius or United States Pharmacopeia (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Lysine and its esters; salts thereof) | 3.7% | kg |
| 2922.41.0090 | Other (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Lysine and its esters; salts thereof) | 3.7% | kg |
| 2922.42.1000 | Monosodium glutamate (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Glutamic acid and its salts) | 6.5% | kg |
| 2922.42.5000 | Other (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Glutamic acid and its salts) | 3.7% | kg |
| 2922.43.1000 | Products described in additional U.S. note 3 to section VI (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Anthranilic acid and its salts) | 6.5% | kg |
| 2922.43.5000 | Other (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Anthranilic acid and its salts) | 6.5% | kg |
| 2922.44.0000 | Tilidine (INN) and its salts (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof) | Free | kg |
| 2922.49.0500 | (R)-α-Aminobenzeneacetic acid; 2-Amino-3-chlorobenzoic acid, methyl ester (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Other > Aromatic) | Free | kg |
| 2922.49.1000 | m-Aminobenzoic acid, technical;p-Aminobenzoic acid; 3,5-Diaminobenzoic acid; 2-Ethylamino-5-sulfobenzoic acid; 3-(N-Ethylanilino)propionic acid, methyl ester;β-(β-Methoxyethoxyethyl)-4-aminobenzoate; Methyl anthranilate; andl-Phenylalanine (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Other > Aromatic) | 5.8% | kg |
| 2922.49.2600 | Drugs (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Other > Aromatic > Other) | 6.5% | kg |
| 2922.49.3000 | Products described in additional U.S. note 3 to section VI (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Other > Aromatic > Other > Other) | 6.5% | kg |
| 2922.49.3700 | Other (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Other > Aromatic > Other > Other) | 6.5% | kg |
| 2922.49.4300 | Glycine (Aminoacetic acid) (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Other > Other > Amino acids) | 4.2% | kg |
| 2922.49.4910 | Alanine (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Other > Other > Amino acids > Other amino acids) | 4.2% | kg |
| 2922.49.4915 | l-Aspartic acid (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Other > Other > Amino acids > Other amino acids) | 4.2% | kg |
| 2922.49.4950 | Other (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Other > Other > Amino acids > Other amino acids) | 4.2% | kg |
| 2922.49.6000 | 3-Aminocrotonic acid, methyl ester; and (R)-α-Amino-1,4-cyclohexadiene-1- acetic acid (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Other > Other > Other) | Free | kg |
| 2922.49.8000 | Other (Oxygen-function amino-compounds > Amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof > Other > Other > Other) | 3.7% | kg |
| 2922.50.0700 | 3,4-Diaminophenetole dihydrogen sulfate; 2-Nitro-5-[(2,3-dihydroxy) propoxy]-N- methyl aniline; 2-Nitro-5-(2-hydroxy ethoxy)-N-methyl aniline; 4-(2-Hydroethoxy)-1,3-phenylene diamine dihydro chloride; 3-Methoxy-4-[(2-hydroxy ethyl) amino] nitro- benzene; 4-[(2-Hydroxy ethyl) amino]-3-nitro phenol; and (R)-α-Amino-4-hydroxy benzene acetic acid (d(-)-p-Hydroxy phenyl glycine) (Oxygen-function amino-compounds > Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function > Aromatic) | Free | kg |
| 2922.50.1000 | dl-3-(3,4-Di hydroxy phenyl) alanine;N-Ethyl-N-(2-methoxy carbonyl ethyl) aniline;dl-Phenyl ephrine base; and Carbonic acid, methyl ester, diester with 2,2'-(m-tolyl amino) diethanol (Toluidine carbonate) (Oxygen-function amino-compounds > Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function > Aromatic) | 5.8% | kg |
| 2922.50.1100 | Salts of d(-)-p-Hydroxyphenylglycine ((R)- α-Amino-4-hydroxybenzeneacetic acid) (Oxygen-function amino-compounds > Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function > Aromatic) | 6.5% | kg |
| 2922.50.1300 | Isoetharine hydrochloride; Isoxsuprine hydrochloride; Nylidrin hydrochloride; Phenylephrine hydrochloride; Salbutamol (Albuterol); and Terbutaline sulfate (Oxygen-function amino-compounds > Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function > Aromatic > Other > Drugs) | Free | kg |
| 2922.50.1400 | Cardiovascular drugs (Oxygen-function amino-compounds > Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function > Aromatic > Other > Drugs > Other) | 6.5% | kg |
| 2922.50.1700 | Dermatological agents and local anesthetics (Oxygen-function amino-compounds > Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function > Aromatic > Other > Drugs > Other) | 6.5% | kg |
| 2922.50.1900 | Guaiacol derivatives (Oxygen-function amino-compounds > Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function > Aromatic > Other > Drugs > Other) | 6.5% | kg |
| 2922.50.2500 | Other (Oxygen-function amino-compounds > Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function > Aromatic > Other > Drugs > Other) | 6.5% | kg |
| 2922.50.3500 | Products described in additional U.S. note 3 to section VI (Oxygen-function amino-compounds > Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function > Aromatic > Other > Other) | 6.5% | kg |
| 2922.50.4000 | Other (Oxygen-function amino-compounds > Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function > Aromatic > Other > Other) | 6.5% | kg |
| 2922.50.5000 | Other (Oxygen-function amino-compounds > Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function) | 6.5% | kg |
Documents required to import under 2922
Customs paperwork typically required to import these goods into the United States. Conditional items depend on shipment value, transport mode, or origin.
- Commercial InvoiceRequired
- Packing ListRequired
- Bill of Lading / Airway BillRequired
- CBP Entry Summary (7501)Required
Prepared and filed by your customs broker
- CBP Entry / Release (3461)Required
Prepared and filed by your customs broker
- Customs Bond (CBP 301)Conditional
Required for formal entries — generally shipments valued over $2,500
Single-entry or continuous bond, obtained through your broker or a surety
- Importer Security Filing (ISF "10+2")Conditional
Required for ocean freight only
Filed electronically at least 24 hours before loading at the foreign port
- Importer ID Input Record (CBP 5106)Conditional
Required to establish or update your importer-of-record number with CBP
One-time setup for a new importer; not filed per shipment
- Entry Manifest (CBP 7533)Conditional
Alternative to the 3461 for informal, low-value, or contiguous-country entries
- Safety Data Sheet (SDS/MSDS)Required
- EPA TSCA CertificationConditional
Required for chemical substances regulated under TSCA
- EPA Notice of Arrival (Form 3540-1)Conditional
Required for pesticides and devices (typically Ch. 38)
Common questions
- What is HTS code 2922?
- HTS heading 2922 covers oxygen-function amino-compounds. It sits in Chapter 29 (organic chemicals) of the US Harmonized Tariff Schedule and contains 70 tariff lines.
- What is the duty rate for HTS 2922?
- General duty rates from 3.7% to 6.5%, with 15 duty-free lines. The general rate applies to most-favoured-nation trading partners; goods from countries with a free trade agreement may qualify for a reduced or duty-free special rate.
- How many digits does a full HTS code have?
- US import entries require the full 10-digit HTS code. Heading 2922 is the first four digits — the remaining six narrow it down to the specific product, which is what determines the duty rate you actually pay.
Related headings in Chapter 29
- 2901Acyclic hydrocarbons
- 2902Cyclic hydrocarbons
- 2903Halogenated derivatives of hydrocarbons
- 2904Sulfonated, nitrated or nitrosated derivatives of hydrocarbons, whether or not halogenated
- 2905Acyclic alcohols and their halogenated, sulfonated, nitrated or nitrosated derivatives
- 2906Cyclic alcohols and their halogenated, sulfonated, nitrated or nitrosated derivatives
- 2907Phenols; phenol-alcohols
- 2908Halogenated, sulfonated, nitrated or nitrosated derivatives of phenols or phenol-alcohols