Photoresist Chemicals Benzoic acid, 3,4-dihydroxy-, 2-[1-[1-(3,4-dimethylphenyl)-1,5-dihydro-3-methyl-5-oxo-4H-pyrazol-4-yl idene]ethyl]hydrazide Cas：681426-53-9 Molecular Formula：C21H22N4O4