t-butyl 3-(2-carboxyethyl)-4-methylpyrrole-2-carboxylate

benzyl 5-acetoxymethyl-4-(2-benzyloxycarbonylethyl)-3-methylpyrrole-2-carboxylate

t-butyl 5-carboxy-3-(2-methoxycarbonylethyl)-4'-(2-carboxyethyl)-3',4-dimethyl-2,2'-methylenedipyrrole-5'-carboxylate

3-(5-((5-((benzyloxy)carbonyl)-3-(3-methoxy-3-oxopropyl)-4-methyl-1H-pyrrol-2-yl)methyl)-2-(tert-butoxycarbonyl)-4-methyl-1H-pyrrol-3-yl)propanoic acid