Photoresist Chemicals Benzoic acid, 2,4-dihydroxy-, 2-[1-[1-[4-(1,1-dimethylethyl)phenyl]-1,5-dihydro-3-methyl-5-oxo-4H-pyr azol-4-ylidene]ethyl]hydrazide Cas：681426-22-2 Molecular Formula：C23H26N4O4