2933Heterocyclic compounds with nitrogen hetero-atom(s) only.

27 subheadings

Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure

Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure

Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure

Compounds containing in the structure a quinoline or isoquinoline ring-system (whether or not hydrogenated), not further fused

Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure

Compounds containing an unfused triazine ring (whether or not hydrogenated) in the structure

Lactams

Other

Source: CBSA Customs Tariff.

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