Sacubitril Impurity - 3

(3R,5S)-5-[(Biphenyl-4-yl)methyl]-3-methylpyrrolidin-2-one; (3R,5S)-5-([1,1'-Biphenyl]-4-ylmethyl)-3-methylpyrrolidin-2-one; Sacubitril Cyclic Impurity;