[(2S,3R)-2-[(2S,3R)-2-Amino-3-((2S,3R,4S,5S,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yloxy)-butyrylamino]-3-((2S,3R,4S,5S,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yloxy)-butyrylamino]-acetic acid benzyl ester 、
(S)-2-(9H-Fluoren-9-ylmethoxycarbonylamino)-3-((2S,3R,4S,5S,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yloxy)-propionic acid 4-nitro-phenyl ester 以78%的产率得到