(+-)-2',4'-Difluoro-alpha-methyl-delta-oxo-N-(phenylmethyl)-(1,1'-biphenyl)-4-butanamide (1,1'-Biphenyl)-4-butanamide, 2',4'-difluoro-alpha-methyl-delta-oxo-N-(phenylmethyl)-, (+-)- 161692-86-0