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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A61K31/54
having six-membered rings with at least one nitrogen and one sulfur as the ring hetero atoms, e.g. sulthiame
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A61K31/542
ortho- or peri-condensed with heterocyclic ring systems
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A61K31/545
Compounds containing 5-thia-1-azabicyclo [4.2.0] octane ring systems, i.e. compounds containing a ring system of the formula: , e.g. cephalosporins,; cefaclor, or cephalexine
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A61K31/546
containing further heterocyclic rings, e.g. cephalothin
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