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U.S. imports of nucleic acids, their salts & other heterocyclic compounds (nesoi) (HS 293499) totaled $542.1M in July 2026, traded with 49 countries.
Importers of Nucleic Acids, Their Salts & Other Heterocyclic Compounds (NESOI) paid $8.6M in duties in July 2026 — an effective duty rate of 7.6% on $113.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. Nucleic Acids, Their Salts & Other Heterocyclic Compounds (NESOI) imports of $542.1M in July 2026 ran 11% below the year-to-date monthly average of $607.6M.
Last updated: July 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.
2.0K shipments/mo
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.
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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.
| Code | Description | Export Value |
|---|---|---|
| 2934990005 | Nucleic Acids & Ther Salts;heterocyclic Comp,NESOI | $175.2M |
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
$542.1MYoY · Pro
Exports
$175.2MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
Ireland and China together supply 80% of it.
customs district
destination
entry
rate provision · imports
6.0% enters free of duty; the effective duty rate is 1.59%.
Subheading 1 of 6 in heading 2934
Subheading 293499 · $542.1M of $575.4M