1-Naphthalenesulfonamide, 4-((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-3-hydroxy-N,N-bis(2-hydroxyethyl)- 1-Phenyl-3-methyl-4-(4'-bis(2''-hydroxyethyl)aminosulfonyl-2'-hydroxynaphthaleneazo)-5-pyrazolone 66142-94-7