1H-pyrrole-2-carboxylic acid, 4-ethyl-, methyl ester InChI=1/C8H11NO2/c1-3-6-4-7(9-5-6)8(10)11-2/h4-5,9H,3H2,1-2H methyl 4-ethyl-1H-pyrrole-2-carboxylate