1-(4-hydroxyphenyl)guanidine

4-hydroxybenzenediazonium chloride

4-(Ethylthio)phenol

4-methyl-N-(4-oxocyclohexa-2,5-dien-1-ylidene)benzenesulfonamide

4-[2-(4-hydroxyphenyl)diazen-1-yl]benzoic acid