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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A61K31/495
having six-membered rings with two; or more; nitrogen atoms as the only ring heteroatoms, e.g. piperazine; or tetrazines
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A61K31/505
Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
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