3-(2-nitrophenyl)-2-propynoic acid, o-Nitro-phenylpropiolsaeure, (2-Nitro-phenyl)-propiolsaeure, (2-Nitro-phenyl)-propinsaeure, 2-Propynoic acid, 3-(2-nitrophenyl)-, 3-(2-nitrophenyl)propiolic acid, 2-nitrophenylpropynoic acid, o-Nitrophenylpropiolic acid, (2-nitro-phenyl)-propiolic acid