Harmonized System
U.S. imports of Heterocyclic Compounds with Unfused Pyridine Ring (NESOI) (HS 293339) totaled $131.4M in August 2026, imported from 35 countries.
Importers of Heterocyclic Compounds with Unfused Pyridine Ring (NESOI) paid $12.0M in duties in August 2026, an average duty rate of 12.63% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Heterocyclic Compounds with Unfused Pyridine Ring (NESOI) imports of $131.4M in August 2026 ran 16% above the year-to-date monthly average of $112.9M.
Last updated: August 2026 dataCompounds containing an unfused pyridine ring but not classifiable as pyridine itself, piperidine, or the named controlled substances cover an exceptionally broad range of commercial products — including herbicides such as paraquat dichloride (2933392300), pyridine-based fungicides (2933392100), antidepressants and tranquilizers (2933393100), and numerous other pharmaceutical and agrochemical intermediates. China and India together dominate US supply under this heading, and Chinese-origin goods across multiple lines are subject to Section 301 tariffs. The heading's fourteen 10-digit lines require careful product-specific classification, particularly for pesticides subject to EPA registration requirements and for drugs subject to FDA oversight.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
658 import shipments a month
Pesticide active ingredients and formulations imported into the US must be registered with the EPA under FIFRA (Federal Insecticide, Fungicide, and Rodenticide Act). Paraquat dichloride (2933392300) is a Restricted Use Pesticide, meaning importers must also ensure the product is destined for a certified applicator or licensed distributor. CBP coordinates with EPA at entry to verify FIFRA compliance.
Line 2933393100 covers antidepressants, tranquilizers, and other psychotherapeutic drugs containing an unfused pyridine ring, while 2933394100 captures other drugs in this chemical family. Classification depends on the compound's pharmacological action and INN designation. When the therapeutic category is ambiguous or the compound has multiple indications, a binding ruling request to CBP is the most reliable path to correct classification.
Subheading 1 of 27 in heading 2933
Subheading 293339 · $131.4M of $493.3M
Trade Directory
List your company under HS 293339 — Heterocyclic Compounds with Unfused Pyridine Ring (NESOI), 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.
| Code | Description | Export Value |
|---|---|---|
| 2933399065 | Compounds Cont An Unfused Pyridine Ring Etc, NESOI | $62.4M |
| 2933399060 | 4-Ap,1-Boc-4-Ap, Nor-Fentanyl,4-Pip, Boc-4-Pip, Salts | $747K |
| 2933399010 | 3-Quinuclindinyl Benzilate | $62K |
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
$131.4MYoY · free account
Exports
$63.2MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $1.2B of Heterocyclic Compounds with Unfused Pyridine Ring (NESOI) and exported $757.5M.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
China and United Kingdom together supply 74% of it.
customs district
destination
entry
rate provision · imports
8.5% enters free of duty; duty collected equals 12.63% of imports for consumption.