DIFF Subgroup
A61K 31/357 having two or more oxygen atoms in the same ring, e.g. crown ethers, guanadrel
Introduced: January 2000
Full Title
Medicinal preparations containing organic active ingredients > Heterocyclic compounds > having oxygen as the only ring hetero atom, e.g. fungichromin > having two or more oxygen atoms in the same ring, e.g. crown ethers, guanadrel
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 1974.
Child Classifications
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- A61K 31/36 Compounds containing methylenedioxyphenyl groups, e.g. sesamin since 1974 IPC+CPC Available in IPC and CPC