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Harmonized System
Section VI > Chapter 29 > Heading 2933 > 2933.2
Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure
Section VI > Chapter 29 > Heading 2933 > 2933.3
Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure
Section VI > Chapter 29 > Heading 2933 > 2933.4
Compounds containing in the structure a quinoline or isoquinoline ring-system (whether or not hydrogenated), not further fused
Section VI > Chapter 29 > Heading 2933 > 2933.5
Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure
Section VI > Chapter 29 > Heading 2933 > 2933.6
Compounds containing an unfused triazine ring (whether or not hydrogenated) in the structure
Section VI > Chapter 29 > Heading 2933 > 2933.1 > 2933.11
Phenazone (antipyrin) and its derivatives
Section VI > Chapter 29 > Heading 2933 > 2933.2 > 2933.21
Hydantoin and its derivatives