4'-(N,N-Dimethylamino)-4-azobenzene sulfonyl hydrazide 4-((4-(Dimethylamino)phenyl)azo)benzenesulfonic acid hydrazide 4-(N,N)-Dimethylaminoazobenzene-4'-sulfonyl hydrazine 72565-41-4 Benzenesulfonic acid, 4-((4-(dimethylamino)phenyl)azo)-, hydrazide Dabs-hydrazide Dabsylhydrazine