Photoresist Chemicals 1,3,4-Thiadiazolo[3,2-a]pyridin-4-ium,8-cyano-7-[2-[4-(dimethylamino)phenyl]ethenyl]-5-methyl-2-phenyl-,perchlorate Cas：77691-62-4 Molecular Formula：C24H21N4S.ClO4