拉西地平系列杂质对照品   
拉西地平杂质a   ethyl methyl(e)-4-{2-[2-(tert-butoxycarbonyl) vinyl] phenyl}-1,4-dihydro-2,6-dimethyl-pyridine-3,5-dicarboxylate   
拉西地平杂质b  diethyl(e)-4-{2-[2-(tert-butoxy-carbonyl) vinyl] phenyl}-2,6-dimethylpyridine-3,5-dicarboxylate  
拉西地平杂质c  diethyl(z)-4-{2-[2-(tert-butoxycarbonyl）vinyl]phenyl}-1，4-dihydro-2,6-dimethylpyridine-3,5-dicarboxylate  
醋酸乌利司他 ulipristal acetate 126784-99-4

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