(E)-3-(1H-indol-2-yl)acrylic acid

methyl 3-(2-(acetylindolyl))-2-propenoate

methyl 3-<2-<3-<1-(hydroxyimino)ethyl>indolyl>>-2-propenoate

phenyl 3-(1-(phenylsulfonyl)-1H-indol-2-yl)acrylate

5-((-2-(1-(benzenesulfonyl)indolyl))methylidene)-2,2-dimethyl-1,3-dioxane-4,6-dione