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SITCSection 5
U.S. imports of heterocyclic compounds with pyrimidine, piperazine, or triazine ring; nucleic acids and salts (SITC 51576) totaled $150.6M in July 2026, traded with 44 countries.
Importers of Heterocyclic Compounds with Pyrimidine, Piperazine, or Triazine Ring; Nucleic Acids and Salts paid $4.8M in duties in July 2026 — an effective duty rate of 7.8% on $61.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. Heterocyclic Compounds with Pyrimidine, Piperazine, or Triazine Ring; Nucleic Acids and Salts imports of $150.6M in July 2026 ran 16% above the year-to-date monthly average of $129.5M.
Basic heading 25 of 465 in section 5
Basic heading 51576 · $150.6M of $28.9B
Spanning 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.
987 shipments/mo
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.
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Imports · July 2026
origin
Ireland and China together supply 56% of it.
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
$150.6MYoY · Pro
Exports
$29.8MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.