InChI=1/C14H18O6/c1-4-7-9-8-20-12(15)10(9)11(13(16)18-5-2)14(17)19-6-3/h4,7,11H,5-6,8H2,1-3H3/b7-4 diethyl {2-oxo-4-[(1E)-prop-1-en-1-yl]-2,5-dihydrofuran-3-yl}malonate propanedioic acid, [2,5-dihydro-2-oxo-4-[(1E)-1-propenyl]-3-furanyl]-, diethyl ester