p. 3696 - 3703
(2007/10/03)(2R,3S)-N-benzyloxycarbonyl-3-benzylaspartic acid 4-methyl ester
(2S,3R)-2-benzyl-3-(benzyloxycarbonylamino)-4-hydroxybutanoic acid methyl ester
(2S,3R)-2-benzyl-3,4-(benzyloxycarbonylimino)-butanoic acid methyl ester
(2S,3R)-2-benzyl-3,4-iminobutanoic acid methyl ester