135279-23-1 2-(4-Chlorophenyl)-9-ethyl-5,6-dihydrothieno(2',3':2,3)thiepino(4,5-c)pyridazin-3(2H)-one Thieno(2',3':2,3)thiepino(4,5-c)pyridazin-3(2H)-one, 2-(4-chlorophenyl)-9-ethyl-5,6-dihydro-