2-ethylhexyl 3-{[2-amino-5-(benzyloxy)phenyl]sulfanyl}propanoate 、 4-{[(2S)-2-(acetylamino)propyl]oxy}benzoic acid 以in the same manner as in Example 2, step C, the title compound (1.02 g) was obtained的产率得到2-ethylhexyl 3-{[2-{[(4-{[(2S)-2-(acetylamino)propyl]oxy}phenyl)carbonyl]amino}-5-(benzyloxy)phenyl]sulfanyl}propanoate