DIFF Subgroup
A61K 31/335 having oxygen as the only ring hetero atom, e.g. fungichromin
Introduced: July 1974
Full Title
Medicinal preparations containing organic active ingredients > Heterocyclic compounds > having oxygen as the only ring hetero atom, e.g. fungichromin
IPC and CPC are identically structured here. All 6 subcodes exist in both systems.
IPC defines codes here since 1974.
Child Classifications
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- A61K 31/336 having three-membered rings, e.g. oxirane, fumagillin since 2000 IPC+CPC Available in IPC and CPC
- A61K 31/34 having five-membered rings with one oxygen as the only ring hetero atom, e.g. isosorbide since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/35 having six-membered rings with one oxygen as the only ring hetero atom since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/357 having two or more oxygen atoms in the same ring, e.g. crown ethers, guanadrel since 2000 IPC+CPC Available in IPC and CPC