(1R)-2β-(2-Methyl-1-propenyl)-3,3-dimethylcyclopropane-1α-carboxylic acid [(2,5-dihydro-2,5-dioxo-3-methyl-1H-pyrrol)-1-yl]methyl ester | (1R)-2β-(2-Methyl-1-propenyl)-3,3-dimethylcyclopropane-1α-carboxylic acid [(2,5-dihydro-2,5-dioxo-3-methyl-1H-pyrrol)-1-yl]methyl ester | |