Tobias acid (2-naphthylamine-1-sulphonic acid)

Tobias acid, naphthylamine sulphonic acid derivative

CIB&RC CLEARANCE · NDPS CLEARANCE

HSN 2921 45 26 (Tobias acid) is subject to Central Insecticides Board and Registration Committee (CIB&RC) registration and import permit under the Insecticides Act, 1968, where the substance figures in the schedule to that Act, with import permitted only at ports specified under Rule 45 of the Insecticides Rules, 1971. Narcotic Drugs and Psychotropic Substances (NDPS) import-certificate conditions under Chapter VII-A of the NDPS Rules, 1985 and Chemical Weapons Convention restrictions under the ITC (HS) Appendix II apply as concurrent overlays. Mandatory Chapter 29 qualifiers under CBIC Circular 23/2023-Cus dated 30-09-2023 are required in the import declaration.

What this is

HSN code

2921 45 26

Chapter

29 · Organic chemicals

Primary regulator

CIB&RC · Insecticides Act, 1968 and Insecticides Rules, 1971

Customs documentation

Registration certificate from CIB&RC
Import permit from CIB&RC
Chapter 29 qualifiers from CBIC

Applicable Partner Government Agencies

CIB&RCCIB&RC·Central Insecticides Board and Registration Committee

NDPSNDPS·Narcotics Control Bureau

Procedural directions for customs clearance are issued by: Directorate General of Foreign Trade, Central Board of Indirect Taxes and Customs.

Compliance steps

1
Verify whether the specific substance falls within the schedule to the Insecticides Act, 1968; if so, obtain both registration and an import permit from the secretariat of the Central Insecticides Board and Registration Committee before filing the bill of entry. Route the consignment exclusively through ports specified under Rule 45 of the Insecticides Rules, 1971.
Insecticides Act, 1968 · Rule 45 of the Insecticides Rules, 1971
2
Where the substance qualifies as an NDPS substance, secure an import certificate under Rule 53 of the NDPS Rules, 1985 for medical or scientific purposes per Chapter VII-A of those Rules, or confirm compliance with Appendix I to the ITC (HS) Schedule under ITC (HS) policy condition 2 to Chapter 29 for other imports.
Chapter VII-A, Rule 53 of the NDPS Rules, 1985 · ITC (HS) policy condition 2 to Chapter 29
3
File the bill of entry with mandatory additional qualifiers for Chapter 29 commodities as stipulated in paragraphs 4.1 and 4.2 of CBIC Circular 23/2023-Cus dated 30-09-2023, effective from 15-10-2023. If the substance attracts Public Liability Insurance Act, 1991 obligations for hazardous substances exceeding specified quantities, ensure the insurance policy is in place per S.O. 227(E) dated 24-03-1992.
CBIC Circular 23/2023-Cus dated 30-09-2023 · S.O. 227(E) dated 24-03-1992

A word of counsel

The most common error on this tariff line is assuming that CIB&RC scheduling is a binary determination made at the border — in practice, the importer must self-assess schedule applicability before the purchase order is placed, because the CIB&RC registration and permit process precedes shipment. Arriving at a non-specified port or filing without the Chapter 29 mandatory qualifiers triggers consignment detention independently of whether the CIB&RC or NDPS clearance is otherwise in order; both the port restriction under Rule 45 of the Insecticides Rules, 1971 and the CBIC qualifier obligation are self-executing at the bill-of-entry stage.

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Frequently asked

Does HSN 2921 45 26 require BIS certification?

No. No BIS Quality Control Order covers naphthylamine sulphonic acid derivatives. Import is governed by the Central Insecticides Board and Registration Committee under the Insecticides Act, 1968, with concurrent NDPS Rules, 1985 and Chemical Weapons Convention overlays administered through ITC (HS) Appendix II policy conditions.

At which ports may this substance be imported, and are there document codes required in e-Sanchit?

Import is restricted to ports specified under Rule 45 of the Insecticides Rules, 1971. The CIB&RC registration certificate and import permit must be uploaded in e-Sanchit before out-of-charge; the Chapter 29 mandatory qualifiers per CBIC Circular 23/2023-Cus are additionally required in the import declaration with effect from 15-10-2023.

Does the CWC restriction on nitrogen mustards and related compounds apply to Tobias acid?

Tobias acid is a naphthylamine sulphonic acid derivative and does not itself fall within the nitrogen mustard or N,N-dialkylaminoethyl-2-chloride families listed in Appendix II, Schedule I (Category 1A and 1B) of the ITC (HS) policy; however, importers should verify the precise chemical identity against those appendices, as co-classified substances under CTI 2921 45 26 may attract CWC conditions.

Last verified against gazette notifications: 2026-05-16. Source: CIB&RC / NDPS / DGFT / CBIC / Indian Customs CUSDATA.