2-[(1R,2S)-3-oxo-2-[(Z)-pent-2-enyl]cyclopentyl]acetate 2-[(1R,2S)-3-keto-2-[(Z)-pent-2-enyl]cyclopentyl]acetate 2-[(1R,2S)-3-oxo-2-[(Z)-pent-2-enyl]cyclopentyl]ethanoate ZINC04492884