methyl (15S,16R,18R)-4-acetyl-16-acetyloxy-23-(hydroxymethyl)-15-methyl-3-oxo-28-oxa-4,14,19-triazaoctacyclo[12.11.2.115,18.02,6.07,27.08,13.019,26.020,25]octacosa-1,6,8,10,12,20(25),21,23,26-nonaene-16-carboxylate 在
camphor-10-sulfonic acid 、
sodium methylate 作用下,
以
甲醇 、
二氯甲烷 为溶剂,
生成 methyl (15S,16R,18R)-23-(ethylsulfanylmethyl)-16-hydroxy-15-methyl-3-oxo-28-oxa-4,14,19-triazaoctacyclo[12.11.2.115,18.02,6.07,27.08,13.019,26.020,25]octacosa-1,6,8,10,12,20(25),21,23,26-nonaene-16-carboxylate