142438-58-2 3,6-Dioxabicyclo(3.1.0)hexane-1-carboxylic acid, 5-ethyl-4-methyl-2-oxo-, methyl ester 4-Ethyl-3-(methoxycarbonyl)-5-methyl-3,4-epoxy-gamma-butyrolactone 4-Ethyl-3-(methoxycarbonyl)-5-methyl-3,4-gamma-butyrolactone CCRIS 4975 Methyl 5-ethyl-4-methyl-2-oxo-3,6-dioxabicyclo(3.1.0)hexane-1-carboxylate