N-(9-phenylfluoren-9-yl)-L-aspartic acid α-t-butyl β-methyl diester
N-tert-butoxycarbonyl aspartic acid tert-butyl ester
1-tert-butyl 4-methyl (2S)-2-(benzylamino)butanedioate
1-(tert-butyl) 4-methyl N-benzyl-N-(9-phenyl-9H-fluoren-9-yl)-L-aspartate
(R)-1-Benzyl-2-[(E)-cyanoimino]-6-oxo-hexahydro-pyrimidine-4-carboxylic acid tert-butyl ester