4-Ethyl-3-methyl-5-trichloromethyl-1H-pyrrole-2-carboxylic acid tert-butyl ester

benzyl 6-(5-(tert-butoxycarbonyl)-3-ethyl-4-methyl-1H-pyrrol-2-yl)-3-methyl-1,4,5,6-tetrahydrocyclopenta[b]pyrrole-2-carboxylate

tert-butyl 4-ethyl-3-methyl-1H-pyrrole-2-carboxylate

6-(5-tert-Butoxycarbonyl-3-ethyl-4-methyl-1H-pyrrol-2-yl)-3-methyl-1,4,5,6-tetrahydro-cyclopenta[b]pyrrole-2-carboxylic acid