[OH:1][C@H:2]1[CH2:6][CH2:5][C@@H:4]([CH2:7][C:8]([O:10][CH3:11])=[O:9])[C@H:3]1[CH2:12][CH2:13][CH2:14][CH2:15][CH3:16]>CO>[O:1]=[C:2]1[CH2:6][CH2:5][C@@H:4]([CH2:7][C:8]([O:10][CH3:11])=[O:9])[C@H:3]1[CH2:12][CH2:13][CH2:14][CH2:15][CH3:16]The intermediate methyl (-)-(1S,2R,3S)-3-hydroxy-2-pentyl-1-cyclopentane acetate presented a [α]20D =-16° (c=1.805, methanol)
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