[Allyloxycarbonyl-(2-{2-[allyloxycarbonyl-(2-{2-[allyloxycarbonyl-(2-tert-butoxycarbonylamino-ethyl)-amino]-acetylamino}-ethyl)-amino]-acetylamino}-ethyl)-amino]-acetic acid methyl ester 在
lithium hydroxide 、 calcium chloride 作用下,
以
异丙醇 为溶剂,
以97%的产率得到[Allyloxycarbonyl-(2-{2-[allyloxycarbonyl-(2-{2-[allyloxycarbonyl-(2-tert-butoxycarbonylamino-ethyl)-amino]-acetylamino}-ethyl)-amino]-acetylamino}-ethyl)-amino]-acetic acid