Heading 2934

Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds

43 declarable lines

Heading 2934 covers nucleic acids and their salts and other heterocyclic compounds not covered by another heading. The lines are split first by ring system (thiazole, benzothiazole, phenothiazine, or other), then by aromatic or modified aromatic status, named compounds, and end use such as pesticide, drug, or photographic chemical.

Products in this heading

2-Methyl-4-isothiazolin-3-one preservative
2-n-Octyl-4-isothiazolin-3-one preservative
2-Mercaptobenzothiazole rubber accelerator
Bentazon herbicide
Phosalone insecticide
Mycophenolate mofetil
Tacrolimus
Timolol maleate

How to choose the right subheading

Identify the heterocyclic ring system in the molecule: unfused thiazole, benzothiazole, phenothiazine, or other.
Check whether the compound is aromatic or modified aromatic, because several lines split on this fact before named-compound or end-use lines.
Match the exact chemical name to a named compound line when one exists, such as 2-methyl-4-isothiazolin-3-one or Bentazon.
If no named line applies, decide by end use: pesticide, photographic chemical, drug, or other.
For fentanyl-related compounds and listed controlled substances, use the specific lines in 2934.91 or 2934.92 before residual other lines.

Often confused with

Penicillin and other antibiotics
Antibiotics are classified in heading 2941, not as other heterocyclic compounds.
Heading 2941
Vitamin C (ascorbic acid)
Vitamins and provitamins are classified in heading 2936.
Heading 2936
Sulfamethoxazole and other sulfonamides
Sulfonamides have their own heading.
Heading 2935
Caffeine and other alkaloids
Alkaloids are classified in heading 2939.
Heading 2939
Thiourea and other organo-sulfur compounds
Organo-sulfur compounds are classified in heading 2930.
Heading 2930

Frequently asked questions

What is the HTS code for 2-methyl-4-isothiazolin-3-one?

Use 2934.10.70.00; the general (MFN) rate is Free.

What is the duty on 2-mercaptobenzothiazole?

2-Mercaptobenzothiazole is classified under 2934.20.15.00, with a general (MFN) rate of 6.5%.

How do I classify a benzothiazole rubber accelerator that is not specifically named?

If it contains a benzothiazole ring system and no more specific named line applies, use 2934.20.80.00 for other compounds; the general (MFN) rate is 6.5%. If it is a pesticide, use 2934.20.35.00, also at a general (MFN) rate of 6.5%.

Guide written from the official schedule text. Rates quoted are general (MFN) rates; check the line page for trade agreement rates and the classification of your exact product.