CPC Subgroup
A61K 31/33 Heterocyclic compounds
Full Title
Medicinal preparations containing organic active ingredients > Heterocyclic compounds
4 direct subcodes
Child Classifications
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- A61K 31/335 having oxygen as the only ring hetero atom, e.g. fungichromin
- A61K 31/38 having sulfur as a ring hetero atom
- A61K 31/395 having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K 31/555 containing heavy metals, e.g. hemin, hematin, melarsoprol