142438-64-0 3-Furancarboxylic acid, 2,5-dihydro-4-ethyl-5-methyl-2-oxo-, methyl ester 4-Ethyl-3-(methoxycarbonyl)-5-methyl-3,4-didehydro-gamma-butyrolactone CCRIS 4979 Methyl 2,5-dihydro-4-ethyl-5-methyl-2-oxo-3-furancarboxylate