1-(9-amino-3-aza-2-oxononyl)-4,7,10-tris(tert-butyloxycarbonylmethyl)-1,4,7,10-tetraazacyclododecane 、
N-Boc-L-glutamic acid α-tert-butyl ester pentafluorophenyl ester 以
二氯甲烷 为溶剂,
以3.2 g的产率得到(S)-1-[2,11-dioxo-14-(tert-butoxycarbonylamino)-14-carboxy-3,10-diazatetradecanyl]-1,4,7,10-tetraazacyclododecane-4,7,10-triacetic acid tetra-tert-butyl ester