having six-membered rings with two nitrogen atoms as the only ring heteroatoms, e.g. piperazine (A61K31/48 takes precedence )

Full Title

Medicinal preparations containing organic active ingredients > Heterocyclic compounds > having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins > having six-membered rings with two nitrogen atoms as the only ring heteroatoms, e.g. piperazine (A61K31/48 takes precedence )

Child Classifications

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• A61K 31/496 Non-condensed piperazines containing further heterocyclic rings, e.g. rifampin, thiothixene or sparfloxacin
• A61K 31/4965 Non-condensed pyrazines
• A61K 31/498 Pyrazines or piperazines ortho- and peri-condensed with carbocyclic ring systems, e.g. quinoxaline, phenazine
• A61K 31/4985 Pyrazines or piperazines ortho- or peri-condensed with heterocyclic ring systems
• A61K 31/499 Spiro-condensed pyrazines or piperazines
• A61K 31/4995 Pyrazines or piperazines forming part of bridged ring systems
• A61K 31/50 Pyridazines; Hydrogenated pyridazines
• A61K 31/505 Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim