# United States tariff lines under HS 2933.79

> The United States tariff splits HS 2933.79 (lactams: Other lactams) into 7 national lines: 2933.79.04.00 (2,5-Dihydro-3,6-diphenylpyrrolo-(3,4-c)- pyrrole-1,4-dione), 2933.79.08.00 (products described in additional U.S. note 3 to section VI), 2933.79.15.00 (other), 2933.79.20.00 (N-Methyl-2-pyrrolidone; and 2-Pyrrolidone) and 3 others. The general (MFN) duty differs by line: free on 2933.79.04.00, 6.5% on 2933.79.08.00, 6.5% on 2933.79.15.00, 4.2% on 2933.79.20.00, 5.5% on 2933.79.30.00, free on 2933.79.40.00 and 6.5% on 2933.79.85.00.

Source: https://border.bot/countries/united-states/hs-codes/293379
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 29](https://border.bot/countries/united-states/hs-codes/29) / [2933.79](https://border.bot/countries/united-states/hs-codes/293379)

## Key facts

- HS subheading: [2933.79](https://border.bot/hs-codes/293379)
- National lines: 7
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 29: Organic chemicals

## United States lines under 2933.79

The United States tariff splits HS 2933.79 (lactams: Other lactams) into 7 national lines: 2933.79.04.00 (2,5-Dihydro-3,6-diphenylpyrrolo-(3,4-c)- pyrrole-1,4-dione), 2933.79.08.00 (products described in additional U.S. note 3 to section VI), 2933.79.15.00 (other), 2933.79.20.00 (N-Methyl-2-pyrrolidone; and 2-Pyrrolidone) and 3 others.

The general (MFN) duty differs by line: free on 2933.79.04.00, 6.5% on 2933.79.08.00, 6.5% on 2933.79.15.00, 4.2% on 2933.79.20.00, 5.5% on 2933.79.30.00, free on 2933.79.40.00 and 6.5% on 2933.79.85.00.

- [2933.79.04.00](https://border.bot/countries/united-states/hs-codes/2933790400) Lactams, Other lactams, Aromatic or modified aromatic, 2,5-Dihydro-3,6-diphenylpyrrolo-(3,4-c)- pyrrole-1,4-dione. Duty (MFN): free
- [2933.79.08.00](https://border.bot/countries/united-states/hs-codes/2933790800) Lactams, Other lactams, Aromatic or modified aromatic, Other, Products described in additional U.S. note 3 to section VI. Duty (MFN): 6.5%
- [2933.79.15.00](https://border.bot/countries/united-states/hs-codes/2933791500) Lactams, Other lactams, Aromatic or modified aromatic, Other, Other. Duty (MFN): 6.5%
- [2933.79.20.00](https://border.bot/countries/united-states/hs-codes/2933792000) Lactams, Other lactams, Other, N-Methyl-2-pyrrolidone; and 2-Pyrrolidone. Duty (MFN): 4.2%
- [2933.79.30.00](https://border.bot/countries/united-states/hs-codes/2933793000) Lactams, Other lactams, Other, N-Vinyl-2-pyrrolidone, monomer. Duty (MFN): 5.5%
- [2933.79.40.00](https://border.bot/countries/united-states/hs-codes/2933794000) Lactams, Other lactams, Other, 12-Aminododecanoic acid lactam. Duty (MFN): free
- [2933.79.85.00](https://border.bot/countries/united-states/hs-codes/2933798500) Lactams, Other lactams, Other, Other. Duty (MFN): 6.5%

## In other countries

No other national tariff on border.bot has live lines under 2933.79 yet.

- [The Harmonized System text for 2933.79](https://border.bot/hs-codes/293379)

- Previous subheading: [2933.72](https://border.bot/countries/united-states/hs-codes/293372) Heterocyclic compounds with nitrogen hetero-atom(s) only
- Next subheading: [2933.91](https://border.bot/countries/united-states/hs-codes/293391) Heterocyclic compounds with nitrogen hetero-atom(s) only

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 2933.79?

The United States tariff splits HS 2933.79 (lactams: Other lactams) into 7 national lines: 2933.79.04.00 (2,5-Dihydro-3,6-diphenylpyrrolo-(3,4-c)- pyrrole-1,4-dione), 2933.79.08.00 (products described in additional U.S. note 3 to section VI), 2933.79.15.00 (other), 2933.79.20.00 (N-Methyl-2-pyrrolidone; and 2-Pyrrolidone) and 3 others.

### What is the duty on HS 2933.79 in the United States?

The general (MFN) duty differs by line: free on 2933.79.04.00, 6.5% on 2933.79.08.00, 6.5% on 2933.79.15.00, 4.2% on 2933.79.20.00, 5.5% on 2933.79.30.00, free on 2933.79.40.00 and 6.5% on 2933.79.85.00.

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 October 2026.

Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/293379.json