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HS 29.33 Heading · Chemicals & Allied Industries

Heterocyclic compounds with nitrogen hetero-atom(s) only

HS heading 29.33 covers Heterocyclic compounds with nitrogen hetero-atom(s) only. It sits within Chapter 29 and breaks down into 27 six-digit subheadings at the border.

Sourcing this category from India

Products classified under HS 29.33 can be sourced from India across a range of clusters and price points. Use this page to understand where Heterocyclic compounds with nitrogen hetero-atom(s) only sits in the tariff schedule, then explore the Indian sectors and products that supply it.

How to read this code

29.33 is the four-digit HS heading. Your destination country extends it to 8–10 digits and assigns the duty rate. India's preferential trade agreements (UAE CEPA, Australia ECTA, and others) can reduce or zero out that duty for many goods — check our import guides for your market.

Subheadings under HS 29.33

The Harmonised System breaks Heterocyclic compounds with nitrogen hetero-atom(s) only into these 27 subheadings. Drill down to the exact classification for your goods.

Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused pyrazole ring (whether or not hydrogenated) in the structure, phenazone (antipyrin) and its derivatives

Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused pyrazole ring (whether or not hydrogenated) in the structure, other than henazone (antipyrin) and its derivatives

Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused imidazole ring (whether or not hydrogenated) in the structure, hydantoin and its derivatives

Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused imidazole ring (whether or not hydrogenated) in the structure, other than hydantoin and its derivatives

Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, pyridine and its salts

Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, piperidine and its salts

Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, alfentanil (INN), anileridine (INN), bezitramide (INN), bromazepam (INN), carfentanil (INN), difenoxin (INN), diphenoxylate (INN), dipipanone (INN)

Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, other fentanyls and their derivatives

Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, 3-quinuclidinol

Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, 4-anilino-N-phenethylpiperidine (ANPP)

Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, N-phenethyl-4-piperdone (NPP)

Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, n.e.c. in 2933.3

Heterocyclic compounds; containing a quinoline or isoquinoline ring-system (whether or not hydrogenated) in the structure, not further fused, levorphanol (INN) and its salts

Heterocyclic compounds; containing a quinoline or isoquinoline ring-system (whether or not hydrogenated) in the structure, not further fused, other than levorphanol (INN) and its salts

Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, malonylurea (barbituric acid) and its salts

Allobarbital (INN), amobarbital (INN), barbital (INN), butalbital (INN), butobarbital, cyclobarbital (INN), methylphenobarbital (INN), pentobarbital (INN), phenobarbital (INN), secbutabarbital (INN), secobarbital (INN) and vinylbital (INN); salts thereof

Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, other derivatives of malonylurea (barbituric acid) and salts thereof, n.e.c. in 2933.53

Heterocyclic 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

Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, (other than malonylurea and its derivatives, loprazolam, mecloqualone, methaqualone, zipeprol, and salts thereof) n.e.c. in 2933.5

Heterocyclic compounds; containing an unfused triazine ring (whether or not hydrogenated) in the structure, melamine

Heterocyclic compounds; containing an unfused triazine ring (whether or not hydrogenated) in the structure, others excluding melamine

Heterocyclic compounds; lactams; 6-hexanelactam (epsilon-caprolactam)

Heterocyclic compounds; lactams; clobazam (INN) and methyprylon (INN)

Heterocyclic compounds; lactams; other than 6-hexanelactam (epsilon caprolactam) and clobazam (INN) and methyprylon (INN)

Heterocyclic compounds; alprazolam (INN), camazepam (INN), chlordiazepoxide (INN), clonazepam (INN), clorazepate, delorazepam (INN), diazepam (INN), estazolam (INN), ethyl loflazepate (INN), fludiazepam (INN), flunitrazepam (INN), (cont)

Heterocyclic compounds; azinphos-methyl (ISO)

Heterocyclic compounds; n.e.c. in headings no. 2933

Related codes in Organic chemicals

Acyclic hydrocarbons

Cyclic hydrocarbons

Halogenated derivatives of hydrocarbons

Sulphonated, nitrated or nitrosated derivatives of hydrocarbons; whether or not halogenated

Acyclic alcohols and their halogenated, sulphonated, nitrated or nitrosated derivatives

Alcohols; cyclic, and their halogenated, sulphonated, nitrated or nitrosated derivatives

Phenols; monophenols, polyphenols, and phenol-alcohols

Phenols or phenol-alcohols; halogenated, sulphonated, nitrated or nitrosated derivatives

Ethers, ether-alcohols, ether-phenols, ether-alcohol-phenols, alcohol peroxides, ether peroxides, acetal and hemiacetal peroxides, ketone peroxides (chemically defined or not), and their halogenated, sulphonated, nitrated or nitrosated derivatives

Epoxides, epoxyalcohols, epoxyphenols and epoxyethers; with a three-membered ring and their halogenated, sulphonated, nitrated or nitrosated derivatives

Acetals and hemiacetals; whether or not with other oxygen function, and their halogenated, sulphonated, nitrated or nitrostated derivatives

Aldehydes, whether or not with other oxygen function; cyclic polymers of aldehydes; paraformaldehyde

Import duty guides by destination

India to Australia India to Canada India to France India to Germany India to Italy India to Japan India to Netherlands India to Saudi Arabia India to Singapore India to Spain India to United Arab Emirates India to United Kingdom India to United States

See full duty context and India-vs-rivals comparisons in our India comparison guides and export resource hub.

Last updated 28 Jun 2026 Figures are indicative sourcing benchmarks compiled from exporter quotes, India trade-scheme notifications and public customs tariffs. Confirm live pricing and HS classification before contracting.

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