Standard International Trade Classification
U.S. imports of Heterocyclic Compounds with Pyrimidine, Piperazine, or Triazine Ring; Nucleic Acids and Salts (SITC 51576) totaled $111.8M in August 2026, imported from 45 countries.
Importers of Heterocyclic Compounds with Pyrimidine, Piperazine, or Triazine Ring; Nucleic Acids and Salts paid $10.6M in duties in August 2026, an average duty rate of 9.82% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Heterocyclic Compounds with Pyrimidine, Piperazine, or Triazine Ring; Nucleic Acids and Salts imports of $111.8M in August 2026 ran 12% below the year-to-date monthly average of $127.3M.
Last updated: August 2026 dataSpanning pyrimidine, piperazine, and unfused triazine ring systems as well as nucleic acids and their salts, this subheading covers some of the most commercially and biologically significant nitrogen heterocyclics in trade. Pyrimidine derivatives include the nucleobases cytosine, thymine, and uracil — foundational to nucleotide chemistry — while piperazine is a high-volume intermediate for anthelmintics and psychiatric APIs. Triazine-based herbicides such as atrazine and melamine (a triazine derivative used in resins) also fall within this broad grouping, making it relevant to agricultural, pharmaceutical, and materials sectors simultaneously.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
1.0K import shipments a month
Nucleic acids (DNA, RNA) and their salts are explicitly included in this subheading when traded as chemical substances rather than as biological reagents or finished diagnostics. In practice, the most commonly traded forms are nucleotide monomers, oligonucleotides, and yeast RNA hydrolysates used in flavor enhancement and biotechnology research.
Melamine (2,4,6-triaminotriazine) is a triazine derivative and can fall within this grouping at the SITC level, though its precise HTS classification should be verified against the current tariff schedule. Melamine imports have historically been subject to antidumping orders from certain origins, so trade-remedy status should be confirmed before importation.
Basic heading 30 of 465 in section 5
Basic heading 51576 · $111.8M of $27.5B
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Imports · August 2026
origin
China and India together supply 46% of it. China pays 17.0% duty; Singapore 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$111.8MYoY · free account
Exports
$25.6MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $1.4B of Heterocyclic Compounds with Pyrimidine, Piperazine, or Triazine Ring; Nucleic Acids and Salts and exported $494.4M.
Through August 2026. Source: U.S. Census Bureau.