2-<<2-(ethoxycarbonyl)-3-methyl-1H-pyrrol-4-yl>carbonyl>benzoic acid
2-<<2-(ethoxycarbonyl)-3-methyl-1H-pyrrol-4-yl>methyl>benzoic acid
ethyl 3-methyl-1H-pyrrole-2-carboxylate
phthalic anhydride
benzyl 2-<<1-benzyl-2-(ethoxycarbonyl)-3-methyl-1H-pyrrol-4-yl>methyl>benzoate