p. 5176 - 5181
(2007/10/03)(S)-2-((tert-butoxycarbonyl)amino)-3-(4-cyanophenyl)propanoic acid
[2-(4-cyano-phenyl)-1-(methoxy-methyl-carbamoyl)-ethyl]-carbamic acid tert-butyl ester
[2-(4-cyano-phenyl)-1-formyl-ethyl]-carbamic acid tert-butyl ester