DIFF Subgroup
A61K 31/397 having four-membered rings, e.g. azetidine
Introduced: January 2000
Full Title
Medicinal preparations containing organic active ingredients > Heterocyclic compounds > having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins > having four-membered rings, e.g. azetidine
No child classifications to compare. This is a leaf node in both IPC and CPC.