2,4-Dihydro-2-(3-hydroxyphenyl)-5-methyl-4-((4-(phenylazo)phenyl)azo)-3H-pyrazol-3-one 2-Pyrazolin-5-one, 1-(m-hydroxyphenyl)-3-methyl-4-((p-(phenylazo)phenyl)azo)- 21519-06-2 3H-Pyrazol-3-one, 2,4-dihydro-2-(3-hydroxyphenyl)-5-methyl-4-((4-(phenylazo)phenyl)azo)- EINECS 244-416-2