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U.S. imports of pyrimidine & piperazine ring compounds (other) (HS 293359) totaled $114.0M in July 2026, traded with 39 countries.
Importers of Pyrimidine & Piperazine Ring Compounds (Other) paid $2.4M in duties in July 2026 — an effective duty rate of 7.7% on $31.4M in dutiable value, based on actual customs collections rather than the published tariff schedule. Pyrimidine & Piperazine Ring Compounds (Other) imports of $114.0M in July 2026 ran 24% above the year-to-date monthly average of $91.8M.
Last updated: July 2026 dataPharmaceutical and agrochemical compounds containing pyrimidine or piperazine ring systems span a wide functional range under this heading, from antihistamines and antinauseants (2933592100) to antidepressants and tranquilizers (2933594600) and multiple pesticide subheadings (2933590500, 2933591000, 2933591500, 2933591800). The US tariff schedule subdivides these compounds extensively by aromatic character, end-use category, and whether they fall under Additional US Note 3 to Section VI — a classification distinction that directly affects duty treatment. Importers of pharmaceutical active ingredients in this heading should confirm FDA drug-substance registration status, while pesticide-use compounds require EPA registration review at entry. The breadth of the heading means misclassification risk is high; a single molecule may qualify under several candidate subheadings depending on its primary commercial use.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
579 shipments/mo
The US tariff schedule repeatedly bifurcates subheadings between aromatic/modified-aromatic compounds and all others. This chemical-structure distinction determines which 10-digit line applies and can affect the applicable duty rate, so importers should confirm the compound's aromatic character with a chemist or customs specialist before filing.
Yes. Bulk drug substances and finished dosage forms classified here are subject to FDA admissibility review. Importers must ensure the product is covered by an active Drug Master File or IND/NDA as appropriate, and shipments may be detained if the foreign manufacturer is not on FDA's approved establishment list. Consult a licensed customs broker or regulatory counsel for specific admissibility requirements.
HSChapter 29
Subheading 2 of 27 in heading 2933
Subheading 293359 · $114.0M of $482.5M
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$114.0MYoY · Pro
Exports
$22.9MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
Ireland and China together supply 61% of it.
customs district
destination
entry
rate provision · imports
20.6% enters free of duty; the effective duty rate is 2.12%.