DesMethyl Norflurazon-d4 4-Chloro-5-aMino-2- [(α,α,α-trifluoro-M-(tolyl-d4)]-3(2H)pyridazinone 5-AMino-4- chloro-2-[(α,α,α-trifluoro-M-(tolyl-d4)]-3(2H)pyridazinone 5-AMino-4-chloro-2-[3-(trifluoroMethyl)phenyl-d4]-3(2H)pyridazinone SAN 9774-d4 Phenobarbital Impurity 18-d3