1-(4-PHENYLAZOPHENYL)HYDRAZINE-2-SULFONIC ACID 2-(p-(Phenylazo)phenyl)hydrazinesulfonic acid 2-[4-(Phenylazo)phenyl]hydrazine-1-sulfonic acid 4-Azobenzenehydrazine-1-sulfonic acid 4-(PHENYLAZO)PHENYLHYDRAZINOSULFONIC ACID AZOBENZENEPHENYLHYDRAZINE SULFONIC ACID Hydrazinesulfonic acid, 2-[4-(2-phenyldiazenyl)phenyl]-