Harmonized System
U.S. imports of Pyrimidine & Piperazine Ring Compounds (Other) (HS 293359) totaled $77.5M in August 2026, imported from 40 countries.
Importers of Pyrimidine & Piperazine Ring Compounds (Other) paid $5.4M in duties in August 2026, an average duty rate of 7.34% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Pyrimidine & Piperazine Ring Compounds (Other) imports of $77.5M in August 2026 ran 14% below the year-to-date monthly average of $90.0M.
Last updated: August 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.
554 import shipments a month
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.
Subheading 4 of 27 in heading 2933
Subheading 293359 · $77.5M of $493.3M
Trade Directory
List your company under HS 293359 — Pyrimidine & Piperazine Ring Compounds (Other), so the companies trading it can find you. Be the first supplier listed.
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
$77.5MYoY · free account
Exports
$20.8MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $1.0B of Pyrimidine & Piperazine Ring Compounds (Other) and exported $336.1M.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
India and United Kingdom together supply 45% of it. United Kingdom pays 16.3% duty; Singapore 0.0%.
customs district
destination
entry
rate provision · imports
29.0% enters free of duty; duty collected equals 7.34% of imports for consumption.