Explanatory notes
… atoms. Nitrosophenols, which are tautomeric forms of quinone oximes, and nitrosoamines, which are tautomeric forms of quinoneimine oximes, are excluded from this heading (see … Phenylsemicarbazide (1-carbamyl-2-phenylhydrazine). (23) Quaternary hydrazinium salts and bases . (24) Hydrazides of …