Patent classifications
A
HUMAN NECESSITIES
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A61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
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A61K
PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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31/00
Medicinal preparations containing organic active ingredients
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A61K31/335
having oxygen as the only ring hetero atom, e.g. fungichromin
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A61K31/357
having two or more oxygen atoms in the same ring, e.g. crown ethers, guanadrel
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