14-[2-(3-(2-(2-guanidino-ethyl)thioureido)ethyl)]-6,7,9,10,13,14,15,16,18,19,21,22-dodecahydro-12H-5,8,11,17,20,23-hexaoxa-14-aza-benzocycloheneicosene-2,3-dicarboxylic acid dimethyl ester dihydrochloride 、
乙酸酐 在
三乙胺 作用下,
以
乙醚 、
二氯甲烷 为溶剂,
以90%的产率得到14-[2-(3-(2-(2-acetyl-guanidino)-ethyl)thioureido)ethyl]-6,7,9,10,13,14,15,16,18,19,21,22-dodecahydro-12H-5,8,11,17,20,23-hexaoxa-14-aza-benzocycloheneicosene-2,3-dicarboxylic acid dimethyl ester