21549 ⎘
Preparations containing radioactive substances for use in therapy or testing characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus; Organic compounds; Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins having six-membered rings with one nitrogen as the only ring hetero atom Vesamicol