# United States tariff line 2933.55.00.00: Loprazolam (INN), mecloqualone (INN), methaqualone (INN) and zipeprol (INN); salts thereof

> In the United States tariff, line 2933.55.00.00 covers compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, loprazolam (INN), mecloqualone (INN), methaqualone (INN) and zipeprol (INN); salts thereof. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 2933.55 in heading 29.33 (chapter 29).

Source: https://border.bot/countries/united-states/hs-codes/2933550000
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) / [2933.55](https://border.bot/countries/united-states/hs-codes/293355) / [2933.55.00.00](https://border.bot/countries/united-states/hs-codes/2933550000)

## Key facts

- Tariff line: 2933.55.00.00
- Covers: Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, loprazolam (INN), mecloqualone (INN), methaqualone (INN) and zipeprol (INN); salts thereof
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [2933.55](https://border.bot/hs-codes/293355)

## What this line covers

In the United States tariff, line 2933.55.00.00 covers compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, loprazolam (INN), mecloqualone (INN), methaqualone (INN) and zipeprol (INN); salts thereof.

Its legal text is “Loprazolam (INN), mecloqualone (INN), methaqualone (INN) and zipeprol (INN); salts thereof”, read under “Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure”.

## How it is structured

It falls under HS subheading 2933.55 in heading 29.33 (chapter 29). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 29: Organic chemicals
- Heading 29.33: Heterocyclic compounds with nitrogen hetero-atom(s) only
- Subheading 2933.55: Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure
- Line 2933.55.00.00: Loprazolam (INN), mecloqualone (INN), methaqualone (INN) and zipeprol (INN); salts thereof

## Duty

Goods under this line enter free of general (MFN) duty.

## In other countries

No other national tariff on border.bot has live lines under 2933.55 yet.

- [The Harmonized System text for 2933.55](https://border.bot/hs-codes/293355)

- Previous line: [2933.54.00.00](https://border.bot/countries/united-states/hs-codes/2933540000) Other derivatives of malonylurea (barbituric acid); salts thereof
- Next line: [2933.59.10.00](https://border.bot/countries/united-states/hs-codes/2933591000) Herbicides

## Frequently asked questions

### What does tariff line 2933.55.00.00 cover in the United States tariff?

In the United States tariff, line 2933.55.00.00 covers compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, loprazolam (INN), mecloqualone (INN), methaqualone (INN) and zipeprol (INN); salts thereof.

### What is the general (MFN) duty on 2933.55.00.00 in the United States?

Goods under this line enter free of general (MFN) duty.

## 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/2933550000.json