2-[2-[19-acetamido-6-(3,4-dicarboxybutanoyloxy)-16,18-dihydroxy-5,9-dimethylicosan-7-yl]oxy-2-oxoethyl]butanedioic acid 、
重氮甲烷 生成 3-O-[19-acetamido-16,18-dihydroxy-6-(5-methoxy-3-methoxycarbonyl-5-oxopentanoyl)oxy-5,9-dimethylicosan-7-yl] 1-O,2-O-dimethyl propane-1,2,3-tricarboxylate