DIFF Subgroup
A61K 31/33 Heterocyclic compounds
Introduced: July 1974
Full Title
Medicinal preparations containing organic active ingredients > Heterocyclic compounds
IPC and CPC are identically structured here. All 4 subcodes exist in both systems.
IPC defines codes here since 1974.
Child Classifications
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- A61K 31/335 having oxygen as the only ring hetero atom, e.g. fungichromin since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/395 having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins since 1974 +1 CPC IPC+CPC Available in IPC and CPC
- A61K 31/555 containing heavy metals, e.g. hemin, hematin, melarsoprol since 1974 IPC+CPC Available in IPC and CPC