Loading...
SITCSection 5
U.S. imports of heterocyclic compounds with unfused pyrazole ring (SITC 51571) totaled $42.1M in April 2026, traded with 18 countries.
Importers of Heterocyclic Compounds with Unfused Pyrazole Ring paid $2.9M in duties in April 2026 — an effective duty rate of 9.3% on $31.1M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataPyrazole-ring heterocyclics — whether fully aromatic or hydrogenated — are a structurally defined subset of nitrogen-only heterocyclic compounds widely used as pharmaceutical active ingredients, agrochemical fungicides, and dye intermediates. The unfused ring requirement is the critical classification boundary: compounds where the pyrazole ring is fused to another ring system fall outside this grouping. Several pyrazole-based active pharmaceutical ingredients (APIs) sourced from Asia are subject to heightened supply-chain scrutiny given their role in finished drug manufacturing.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
An unfused pyrazole ring stands alone and is not joined to a second ring system. If the pyrazole ring is fused — for example, forming an indazole — the compound classifies under a different heterocyclic heading. This structural distinction is the primary classification decision point and should be confirmed with reference to the compound's structural formula.
Certain pyrazole intermediates and APIs sourced from China may be subject to Section 301 tariffs depending on the specific compound and its HTS classification. Importers should verify the applicable 10-digit HTS code and check current Section 301 lists before shipment.
Supplier Network
Get discovered by U.S. importers searching for HS 51571 — Heterocyclic Compounds with Unfused Pyrazole Ring. Be the first supplier listed.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| SWITZERLAND | $20.7M | -- | -$20.7M |
| GERMANY | $14.2M | $1.2M | -$13.1M |
| ITALY | $1.7M | -- | -$1.7M |
| JAPAN | $1.7M | -- | -$1.7M |
| UNITED KINGDOM | $1.5M | $3K | -$1.5M |
Monthly import values over time