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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 $146.5M in April 2026, traded with 40 countries.
Importers of Heterocyclic Compounds with Pyrimidine, Piperazine, or Triazine Ring; Nucleic Acids and Salts paid $3.6M in duties in April 2026 — an effective duty rate of 7.3% on $48.5M 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 $146.5M in April 2026 ran 13% above the year-to-date monthly average of $129.1M.
Last updated: April 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.
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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| Country | Imports | Exports | Balance |
|---|---|---|---|
| SWITZERLAND | $63.8M | $774K | -$63.0M |
| CHINA | $20.9M | $322K | -$20.6M |
| BRAZIL | -- | $12.1M | +$12.1M |
| INDIA | $11.5M | $113K | -$11.4M |
| SPAIN | $9.4M | -- | -$9.4M |
Monthly import values over time