Pyridine and its salts
Heterocyclic compounds with oxygen hetero-atom(s) only. > Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure: > Pyridine and its salts > Pyridine and its salts
Duty Rate (from China)
Products classified under Tariff item 2933.31.00.00
2-Aminopyridine (CAS 109-06-8)
2-Aminopyridine is an aromatic amine derivative featuring an unfused pyridine ring with an amino group at the 2-position. It is primarily used as an intermediate in pharmaceutical and agrochemical synthesis. Despite the amino substitution, the compound retains the pyridine ring structure, which governs its classification under this tariff item.
2933.31.002-Picoline (2-Methylpyridine) (CAS 109-06-8)
2-Picoline, also known as 2-methylpyridine, is a liquid alkyl derivative of pyridine with a methyl group at the 2-position. It is widely used in the production of agrochemicals, pharmaceuticals, and rubber chemicals. The single methyl substitution does not alter the fundamental pyridine ring structure, keeping it within the scope of this tariff item.
2933.31.004-Dimethylaminopyridine (DMAP) (CAS 1122-58-3)
4-Dimethylaminopyridine (DMAP) is a pyridine derivative with a dimethylamino group at the 4-position, widely used as a nucleophilic catalyst in esterification and acylation reactions. Its classification is determined by the unfused pyridine ring, which is the core structural feature. DMAP is a separate chemically defined organic compound, meeting Chapter 29 requirements.
2933.31.00Pyridine-3-carboxylic Acid (Nicotinic Acid) (CAS 59-67-6)
Nicotinic acid, also known as pyridine-3-carboxylic acid or vitamin B3, is a pyridine derivative with a carboxylic acid group at the 3-position. It is essential for human nutrition and used in pharmaceutical and food applications. The pyridine ring structure is the primary determinant for classification under this tariff item, despite the carboxylic acid function.
2933.31.00Pyridine (CAS 110-86-1)
Pyridine is the base compound of this tariff item, a flammable, colorless liquid with the formula C5H5N, containing an unfused pyridine ring. It is used as a solvent and reagent in organic synthesis for pharmaceuticals, agrochemicals, and other industrial applications. As the parent compound, it is directly covered by this tariff item.
2933.31.00Pyridine Hydrochloride (CAS 628-13-7)
Pyridine hydrochloride is the crystalline salt formed from pyridine and hydrochloric acid, used as a catalyst and reagent in organic reactions. It contains the pyridine ring structure and is classified with the organic base per Chapter 29 Note 5(C)(1). The salt form is a separate chemically defined compound, meeting the requirements of this tariff item.
2933.31.00Pyridine N-Oxide (CAS 694-59-7)
Pyridine N-oxide is a derivative of pyridine where an oxygen atom is bonded to the nitrogen, forming an N-oxide. It is used as an intermediate in organic synthesis, particularly in oxidation reactions. The compound retains the pyridine ring structure, and the N-oxide function does not exclude it from this tariff item, as it remains a separate chemically defined organic compound.
2933.31.00Pyridine Sulfate
Pyridine sulfate is the acidic salt formed from pyridine and sulfuric acid, used in analytical chemistry and as a reagent. Per Chapter 29 Note 5(C)(1), inorganic salts of organic compounds are classified with the organic compound, which is pyridine. The salt is a separate chemically defined compound, meeting the requirements of this tariff item.
2933.31.00Pyridinium Dichromate (CAS 14019-34-6)
Pyridinium dichromate is an orange crystalline compound used as an oxidizing agent in organic synthesis, formed from pyridine and chromic acid. Per Chapter 29 Note 5(C)(1), the salt is classified with the organic pyridine component. The compound contains an unfused pyridine ring and is a separate chemically defined compound, meeting the requirements of this tariff item.