142438-59-3 3,4-Epoxy-5-isopropyl-3-(methoxycarbonyl)-4-methyl-gamma-butyrolactone 3,6-Dioxabicyclo(3.1.0)hexane-1-carboxylic acid, 5-methyl-4-(1-methylethyl)-2-oxo-, methyl ester CCRIS 4976