threo-2-(1-Ethoxyethoxy)-3-tert-butyloxycarbonylamino-3-phenylpropionic acid 、 [(1S,2S,3R,4R,7R,9S,10S,12R,15S)-4-acetyloxy-1,15-dihydroxy-10,14,17,17-tetramethyl-11-oxo-2-phenylmethoxy-12-(2,2,2-trichloroacetyl)oxy-6-oxatetracyclo[11.3.1.03,10.04,7]heptadec-13-en-9-yl] 2,2,2-trichloroacetate 生成 [(1S,2S,3R,4R,7R,9S,10S,12R,15S)-4-acetyloxy-1-hydroxy-10,14,17,17-tetramethyl-11-oxo-2-phenylmethoxy-9,12-bis[(2,2,2-trichloroacetyl)oxy]-6-oxatetracyclo[11.3.1.03,10.04,7]heptadec-13-en-15-yl] 2-(1-ethoxyethoxy)-3-[(2-methylpropan-2-yl)oxycarbonylamino]-3-phenylpropanoate