(1)Benzothiepino(5,4-c)pyridazin-3(2H)-one, 2-(4-chlorophenyl)-5,6-dihydro-, 7-oxide 118288-67-8 2-(4-Chlorophenyl)-5,6-dihydro-(1)-benzothiepino(5,4-c)pyridazin-3(2H)-one-7-oxide Y 23684 Y-23684