2-2,4-二甲基-5-(叔丁氧羰基)-3-吡咯丙酸甲酯

benzyl 3-(2-benzyloxycarbonylethyl)-2,4-dimethylpyrrole-5-carboxylate

t-butyl 5-iodo-3-(2-methoxycarbonylethyl)-4-methylpyrrole-2-carboxylate

4-(2'-methoxycarbonylethyl)-3-methyl-5-t-butoxycarbonylpyrrole-2-carboxylic acid

tert-butyl 5-acetoxymethyl-4-(2-methoxycarbonylethyl)-3-methyl-pyrrole-2-carboxylate