4-cyano-3-[4-(2-cyanophenyl)phenyl]-5-ethyl-1-methylpyrrole-2-carboxylic acid
4-cyano-3-[4-(2-cyanophenyl)phenyl]-5-ethyl-1-methyl-pyrrole-2-carboxylic acid
4-cyano-3-[4-(2-cyanophenyl)phenyl]-5-ethyl-1-methyl-2-pyrrolecarboxylic acid