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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A61K31/395
having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
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A61K31/40
having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
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A61K31/409
having four such rings, e.g. porphine derivatives, bilirubin, biliverdine
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