30957-62-1 4-((3-Methyl-5-oxo-1-phenyl-2-pyrazolin-4-yl)azo)salicylic acid BRN 0899311 Salicylic acid, 4-((3-methyl-5-oxo-1-phenyl-2-pyrazolin-4-yl)azo)- p-(3-Methyl-5-oxo-1-phenyl-2-pyrazolin-4-ylazo)salicylic acid