Nα-benzyloxycarbonyl-L-histidine 、
1,3:4,6-bis<3,3':6,6'-bis<1,4,10,13-tetraoxa-7-(5-hydroxy-3-oxapent-1-yl)-7-azatridecamethylene>-1,2-xylylene>tetrahydro-3a,6a-diphenylimidazo<4,5-d>imidazole-2,5(1H,3H)-dione 在
N,N'-二环己基碳二亚胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以45.5%的产率得到1,3:4,6-bis<3,3':6,6'-bis(1,4,10,13-tetraoxa-7-(5-(N-benzyloxycarbonyl)-L-histidyl)-3-dioxapent-1-yl)-7-azatridecamethylene)-1,2-xylylene>tetrahydro-3a,6a-diphenylimidazo<4,5-d>imidazole-2,5(1H,3H)-dione