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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51/00
Preparations containing radioactive substances for use in therapy or testing in vivo
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A61K51/02
characterised by the carrier; , i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
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A61K51/041
Heterocyclic compounds
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A61K51/044
having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins
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A61K51/0453
having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
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