3-[3-[(3-carboxy-1-oxoallyl)oxy]-2,2-dimethyl-1-oxopropoxy]-2,2-dimethylpropyl maleate

(Z)-2-Butenedioic acid hydrogen 1-[3-[3-[[(Z)-3-carboxy-1-oxo-2-propenyl]oxy]-2,2-dimethyl-1-oxopropoxy]-2,2-dimethylpropyl] ester