p. 1960 - 1968
(2007/10/03)(RS)-4-oxo-3-{[(phenylmethoxy)carbonyl]amino}butanoic acid 1,1-dimethylethyl ester
trimethyl orthoformate
N-[(phenylmethoxy)carbonyl]-D-aspartic acid,1,1-dimethylethyl ester
(RS)-4-hydroxy-2-{[(phenylmethoxy)carbonyl]amino}butanoic acid 1,1-dimethylethyl ester