1-Naphthalenesulfonyl chloride, 3-(benzoyloxy)-4-((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)- 1-Phenyl-3-methyl-4-(2'-benzoyloxy-4'-chlorosulfonylnaphthylazo)-5-pyrazolone 3-(Benzoyloxy)-4-((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)naphthalene-1-sulphonyl chloride 66104-73-2 EINECS 266-160-0