2-cyano-3-indol-3-yl-acrylic acid ethyl ester, ethyl 2-cyano-3-(1H-indol-3-yl)acrylate, 2-Cyan-3-(3-indolyl)acrylsaeure-methylester, ethyl (E)-2-cyano-3-(1H-indol-3-yl)-2-propenoate, ethyl (E)-2-cyano-3-(1H-indol-3-yl)acrylate, ethyl trans-alfa-cyano-3-indole-acrylate, 2-Cyan-3-indol-3-yl-acrylsaeure-aethylester, 3-<(2-cyano-2-ethoxycarbonyl)ethenyl>indole, 2-Cyano-3-(1H-indol-3-yl)propenoic acid ethyl ester