2-[2-[2-(1-Tert-butoxycarbonyl-3-methyl-butylcarbamoyl)-4-methoxy-phenyldisulfanyl]-5-methoxy-benzoylamino]-4-methyl-pentanoic acid tert-butyl ester 、
三氟乙酸 、
苯甲醚 在
crude product 、
水合甲醇 作用下,
以
二氯甲烷 为溶剂,
以to afford 0.7 g of the title compound, mp 168°-169° C.的产率得到[S-(R*,R*)]2-{2-[2-(1-Carboxy-3-methyl-butylcarbamoyl)-4-methoxy-phenyldisulfanyl]-5-methoxybenzoylamino}-4-methyl-pentanoic acid