Photoresist Chemicals 1H-Pyrazolo[3,4-b]pyridine-5-carboxylic acid, 4,7-dihydro-1,3,6-trimethyl-4-(3-nitrophenyl)-, ethyl ester, monohydrochloride Cas:93181-55-6 Molecular Formula:C18H20N4O4.ClH