Sacubitril Impurity

(2E,4S)-5-[1,1''-Biphenyl]-4-yl-4-[[(1,1-dimethylethoxy)carbonyl]amino]-2-methyl-2-pentenoic Acid was used in the study to process for preparation of biaryl-substituted 4-aminobutyric acids by hydrogenation of the corresponding alkenoates.