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Heterocyclic compounds with nitrogen heteroatom(s) only
Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure
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Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure
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Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure
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Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure
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Compounds containing an unfused triazine ring (whether or not hydrogenated) in the structure
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Compounds containing in the structure a quinoline or isoquinoline ringsystem (whether or not hydrogenated), not further fused
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Lactams
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Other
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