3-[24-(2-tert-butoxycarbonyl-ethyl)-9,20-bis-tert-butoxycarbonylmethyl-4,7,10,19,22,25-hexaoxo-3,6,8,11,18,21,23,26-octaaza-tricyclo[26.2.2.213,16]tetratriaconta-1(31),13(34),14,16(33),28(32),29-hexaen-5-yl]-propionic acid tert-butyl ester 在
三氟乙酸 作用下,
反应 12.0h,
以81%的产率得到3-[(5S,9S,20S,24S)-24-(2-Carboxy-ethyl)-9,20-bis-carboxymethyl-4,7,10,19,22,25-hexaoxo-3,6,8,11,18,21,23,26-octaaza-tricyclo[26.2.2.2
13,16]tetratriaconta-1(31),13(34),14,16(33),28(32),29-hexaen-5-yl]-propionic acid