1,1'-(1,4-Phthalazinediyldiimino)bis(3-chloro-4-(4-fluorophenyl)-2-azetidinone) 139108-70-6 2-Azetidinone, 1,1'-(1,4-phthalazinediyldiimino)bis(3-chloro-4-(4-fluorophenyl)-