HS Code 29.34 – Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds

HS code 2934 is a 4-digit heading in the Harmonized System that covers: Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds. Heading 2934 covers 'Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds' within Chapter 29. This is a crucial and somewhat residual category for heterocyclic compounds that do not exclusively contain oxygen (2932) or nitrogen (2933) as their heteroatom(s). Its primary specific inclusions are nucleic acids (DNA, RNA) and their salts, which are complex biopolymers fundamental to life and biotechnology. Beyond nucleic acids, this heading encompasses a vast array of 'other' heterocyclic compounds, meaning those containing: (a) both oxygen and nitrogen heteroatoms, (b) sulfur as a heteroatom (e.g., thiophenes, thiazoles, penicillins), (c) other heteroatoms like selenium or tellurium, or (d) combinations thereof. This broad scope makes it vital for biotechnology, pharmaceuticals, genetic research, and specialty chemical industries. Key sub-categories include compounds with multiple different heteroatoms in the ring, or rings containing sulfur, phosphorus, etc. Understanding its boundaries is critical for distinguishing complex APIs (like penicillin) from simpler heterocycles or formulated diagnostic reagents (Chapter 38). Its importance has grown significantly with advancements in genetic engineering and biopharmaceuticals, making accurate classification essential for navigating complex trade regulations, intellectual property, and biosafety protocols.

Deoxyribonucleic acid (DNA), Ribonucleic acid (RNA), Salts of DNA/RNA, Adenosine triphosphate (ATP), Guanosine triphosphate (GTP), Cyclic adenosine monophosphate (cAMP), Penicillin (e.g., Penicillin G potassium), Cephalosporins, Thiazole, Thiophene, Oxazole, Trimethoprim, Folic acid, Biotin, Sulfathiazole, Pyrithione zinc, Certain oligonucleotides, Uridine triphosphate (UTP), Cytidine triphosphate (CTP), Theobromine, Mercaptopurine, Azathioprine

The 'other heterocyclic compounds' aspect of 2934 frequently leads to misclassification. Traders often mistakenly place compounds with both oxygen and nitrogen heteroatoms under 2932 or 2933, failing to recognize that 2934 is the correct residual category for such combinations. For example, Trimethoprim, containing both oxygen and nitrogen in its heterocyclic rings, is often confused with 2933. Another common error is classifying formulated diagnostic reagents containing nucleic acids under 2934 instead of Chapter 38 (e.g., 3822 for diagnostic reagents), as 2934 is intended for pure, isolated nucleic acids or defined chemical compounds, not prepared kits or mixtures.

In 2025, the top exporters of HS code 2934 in UN Comtrade data were Ireland ($6.5B, 21% of world exports), China ($5.2B) and Switzerland ($3.5B). World exports came to about $31.0B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

In 2025, the top importers of HS code 2934 in UN Comtrade data were the United States ($9.7B, 29% of world imports), Germany ($5.1B) and Ireland ($1.7B). World imports came to about $33.9B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

HS code 2934 is a 4-digit heading under Chapter 29 of the Harmonized System. The first 2 digits (29) identify the chapter, and digits 3-4 (34) specify the heading. This code contains multiple 6-digit subheadings for precise product classification.