5'-Carboxy-3',4-dimethyl-3-vinyl-5(1H)-pyrromethenon-4'-propionsaeure

3-(2-Methoxycarbonyl-ethyl)-4-methyl-5-[3-methyl-5-oxo-4-vinyl-1,5-dihydro-pyrrol-(2E)-ylidenemethyl]-1H-pyrrole-2-carboxylic acid methyl ester

3-(2-Methoxycarbonyl-ethyl)-4-methyl-5-[4-methyl-5-oxo-3-vinyl-1,5-dihydro-pyrrol-(2E)-ylidenemethyl]-1H-pyrrole-2-carboxylic acid methyl ester

5'-Carboxy-3,3'-dimethyl-4-vinyl-5(1H)-pyrromethenon-4'-propionsaeure

4,3'-Dimethyl-3-vinyl-5(1H)-pyrromethenon-4'-propionsaeure