2,3-bis-phenylhydrazono-butyric acid

3-(4-Nitro-phenyl)-5-[1-(phenyl-hydrazono)-ethyl]-2-[(Z)-phenylimino]-2,3-dihydro-[1,3,4]thiadiazin-6-one

3-(4-Nitro-phenyl)-5-{1-[(4-nitro-phenyl)-hydrazono]-ethyl}-2-[(Z)-phenylimino]-2,3-dihydro-[1,3,4]thiadiazin-6-one

5-{1-[(2,4-Dinitro-phenyl)-hydrazono]-ethyl}-3-(4-nitro-phenyl)-2-[(Z)-phenylimino]-2,3-dihydro-[1,3,4]thiadiazin-6-one

2-[(4-Nitrophenyl)hydrazono]-3-oxo-butanoic acid ethyl ester