Photoresist Chemicals 2-Thiophenesulfonamide, 5-(5-ethyl-1,6-dihydro-2-methyl-6-oxo-3-pyridinyl)-N-[2-(3-pyridinyl)ethyl] -, monohydrochloride Cas:867008-35-3 Molecular Formula:C19H21N3O3S2.ClH