(1R,3R)-2,2-二甲基-3-(2-甲基丙-1-烯基)环丙烷-1-羧酸

3,5,5-triethoxy-2-methylcyclopent-2-en-1-one

2,2-dimethyl-3R-(2'-methyl-1'-propenyl)-cyclopropane-1R-carboxylic acid chloride

4-methyl-5-prop-2-enylcyclopent-4-ene-1,3-dione