N,N-bis(2-chloroethyl)-4-[(4-nitrophenyl)diazenyl]aniline

(4-methoxy-2,6-dimethylphenyl)-(4-nitrophenyl)diazene

2-nitro-4-[(4-nitrophenyl)hydrazinylidene]cyclohexa-2,5-dien-1-one

N-[(2-imino-4-phenyl-1,3-thiazol-5-ylidene)amino]-4-nitroaniline

6-[(4-nitrophenyl)hydrazinylidene]-3-oxocyclohexa-1,4-diene-1-carboxylic acid