4-Amino-N-(3-{3-[3-(7-oxo-7H-furo[3,2-g]chromen-9-yloxy)-propylcarbamoyl]-propylcarbamoyl}-propyl)-butyramide 、
2-[(6-{[Benzyloxycarbonyl-(2-benzyloxycarbonylamino-ethyl)-amino]-methyl}-pyridine-2-carbonyl)-amino]-3-(3H-imidazol-4-yl)-propionic acid 在
1-羟基苯并三唑 、
N,N'-二环己基碳二亚胺 作用下,
以40%的产率得到{2-[Benzyloxycarbonyl-(6-{2-(3H-imidazol-4-yl)-1-[3-(3-{3-[3-(7-oxo-7H-furo[3,2-g]chromen-9-yloxy)-propylcarbamoyl]-propylcarbamoyl}-propylcarbamoyl)-propylcarbamoyl]-ethylcarbamoyl}-pyridin-2-ylmethyl)-amino]-ethyl}-carbamic acid benzyl ester