(E,E)-2-(4-Carboxy-3-methyl-1,3-butadienyl)-1,3-dimethyl-4-oxo-2-cyclohexene-1-carboxylic acid 2-Cyclohexene-1-carboxylic acid, 2-(4-carboxy-3-methyl-1,3-butadienyl)-1,3-dimethyl-4-oxo-, (E,E)- 67192-53-4