乙酸酐 、 3-Hydroxy-2-[2-({5-hydroxy-2-[(2-hydroxy-4-methyl-pentanoyl)-methyl-amino]-4-methyl-pentanoyl}-methyl-amino)-3-methyl-butyrylamino]-butyric acid methyl ester 在
吡啶 作用下,
生成
3-Acetoxy-2-[2-({5-acetoxy-2-[(2-acetoxy-4-methyl-pentanoyl)-methyl-amino]-4-methyl-pentanoyl}-methyl-amino)-3-methyl-butyrylamino]-butyric acid methyl ester