U.S. imports of Nucleic Acids, Their Salts & Other Heterocyclic Compounds (NESOI) (HS 293499) totaled $284.3M in August 2026, imported from 50 countries.
Importers of Nucleic Acids, Their Salts & Other Heterocyclic Compounds (NESOI) paid $21.3M in duties in August 2026, an average duty rate of 8.98% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Nucleic Acids, Their Salts & Other Heterocyclic Compounds (NESOI) imports of $284.3M in August 2026 ran 50% below the year-to-date monthly average of $567.2M.
Last updated: August 2026 dataServing as the catch-all for heterocyclic chemistry not captured by more specific headings, this group spans an exceptionally broad commercial range — from nucleic acids and immunosuppressants like mycophenolate mofetil (2934990100) to agrochemical actives used as fungicides (2934991200), herbicides (2934991500), and insecticides (2934991600), as well as photographic chemicals (2934992000) and aromatic drug intermediates (2934993000). Singapore and Ireland lead US imports under this heading, reflecting their roles as regional pharmaceutical manufacturing and distribution hubs, with China and India supplying significant volumes of agrochemical and drug-intermediate material. The heading's breadth means classification disputes are common; the correct 10-digit line turns on the compound's specific chemical structure, end-use function, and whether it falls within US Note 3 to Section VI.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
2.1K import shipments a month
The US schedule separates compounds by primary end-use function: lines 2934991200 through 2934991800 cover compounds used as fungicides, herbicides, insecticides, and other pesticides, while 2934993000 and 2934994700 cover aromatic and non-aromatic drug compounds. Classification follows the compound's principal use at the time of importation, supported by technical data sheets, EPA registration numbers for pesticides, or FDA drug master file references for pharmaceutical actives. When a compound has dual-use potential, binding ruling requests to CBP are advisable.
Mycophenolate mofetil (2934990100) is an immunosuppressant drug substance and therefore subject to FDA admissibility review as an imported drug. The foreign manufacturer must be registered with FDA, and the substance must conform to applicable pharmacopeial or drug master file specifications. It is not a DEA-scheduled substance, but FDA may detain shipments from unregistered establishments or those with prior import alerts. Consult a licensed customs broker or regulatory counsel familiar with FDA drug import procedures before arranging shipment.
Subheading 1 of 6 in heading 2934
Subheading 293499 · $284.3M of $324.9M
ImportsExports
Imports
$284.3MYoY · free account
Exports
$62.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $7.7B of Nucleic Acids, Their Salts & Other Heterocyclic Compounds (NESOI) and exported $1.4B.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
India and Switzerland together supply 41% of it. India pays 13.9% duty; Ireland 2.3%.
customs district
destination
entry
rate provision · imports
23.0% enters free of duty; duty collected equals 8.98% of imports for consumption.
Trade Directory
List your company under HS 293499 — Nucleic Acids, Their Salts & Other Heterocyclic Compounds (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 |
|---|---|---|
| 2934990005 | Nucleic Acids & Ther Salts; Heterocyclic Comp, NESOI | $62.3M |
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.