142457-04-3 3,4-Epoxy-5-hydroxy-5-isopropyl-3-(methoxycarbonyl)-4-methyl-gamma-butyrolactam 6-Oxa-3-azabicyclo(3.1.0)hexane-1-carboxylic acid, 4-hydroxy-5-methyl-4-(1-methylethyl)-2-oxo-, methyl ester CCRIS 4985