1,1'-(1,4-Phthalazinediyldiimino)bis(3-chloro-4-(3,5-dichlorophenyl)-2-azetidinone) 139108-72-8 2-Azetidinone, 1,1'-(1,4-phthalazinediyldiimino)bis(3-chloro-4-(3,5-dichlorophenyl)-