7-Ethoxycarbonyl-2-(4-nitrophenyl)-5,6,7,8-tetrahydroimidazo(2',1':2,3)thiazolo(5,4-c)pyridine 74004-56-1 Imidazo(2',1':2,3)thiazolo(5,4-c)pyridine-7(6H)-carboxylic acid, 5,8-dihydro-2-(4-nitrophenyl)-, ethyl ester