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4-Hydroxycyclopent-2-en-1-one61305-27-9100 % similar 1,4-Cyclohex-2-enedione4505-38-833 % similar 2-Cyclopentene-1,4-dione930-60-933 % similar (1R,4S)-(+)-4-Hydroxy-2-cyclopentenyl acetate60410-16-431 % similar