Cyclopentenone derivative

摘要

A cyclopentenone derivative represented by the following formula [I] or an optically active substance or a salt thereof. (In the formula, R1 and R2 are same or different and each of them is straight or branched alkyl group, straight or branched alkenyl group, aromatic group, aromatic-aliphatic group or H with a proviso that the case where R1=R2=H, or R1=benzyl group and R2=H is excluded.