Synonyms: 1,1'-(1,4-Phthalazinediyldiimino)bis(3-chloro-4-(3,5-dichlorophenyl)-2-azetidinone);2-Azetidinone, 1,1'-(1,4-phthalazinediyldiimino)bis(3-chloro-4-(3,5-dichlorophenyl)-;AC1O4Q1M;LS-23165;139108-72-8;3-chloro-1-[[4-[[3-chloro-2-(3,5-dichlorophenyl)-4-oxoazetidin-1-yl]amino]phthalazin-1-yl]amino]-4-(3,5-dichlorophenyl)azetidin-2-one