4H-Imidazo(1,5-a)thieno(2,3-f)(1,4)diazepine-3-carboxylic acid, 5,6-dihydro-5-methyl-6-oxo-, 1,1-dimethylethyl ester 99632-94-7 Ro 19-4603 Ro-19-4603 tert-Butyl-5,6-dihydro-5-methyl-6-oxo-4H-imidazo(1,5-a)thieno(2,3-f)(1,4)diazepine-3-carboxylate