- Py001: Benzyl 4-acetyl-3-(2-ethoxycarbonylethyl)-5-methylpyrrole-2-carboxylate
- Py002: Ethyl 4-acetyl-3-(2-ethoxycarbonylethyl)-5-methylpyrrole-2-carboxylate
- Py003: Ethyl 4-methyl-3,5-dimethylpyrrole-2-carboxylate
- Py004: Ethyl 5-acetoxymethyl-3-(2-methoxycarbonylethyl)-4-methoxycarbonylmethylpyrrole-2-carboxylate