1 335 [4-(2-(1h-1,2,3-benzotriazol-1-yl)-3-{4-[difluoro(phosphono)methyl]phenyl}-2-phenylpropyl)phenyl](difluoro)methylphosphonic acid 1.000 2 P27 {[2-(1h-1,2,3-benzotriazol-1-yl)-2-(3,4-difluorophenyl)propane-1,3-diyl]bis[4,1-phenylene(difluoromethylene)]}bis(phosphonic acid) 0.957