[CH3:1][C:2]1([CH3:17])[C:9](=[CH2:10])[CH:8]2[CH2:11][CH2:12][CH:13]([C:14]([OH:16])=[O:15])[C:6]32[CH2:7][CH:3]1[CH2:4][CH2:5]3.C(O)=O.C(O)C>O>[CH3:10][C:9]1[C:2]([CH3:1])([CH3:17])[CH:3]2[CH2:7][C:6]3([CH2:5][CH2:4]2)[C:8]=1[CH2:11][CH2:12][CH:13]3[C:14]([OH:16])=[O:15]500 mg of vetivenic acid (see example 1) were treated with formic acid under the same conditions as those described in example 2. The pure compound was obtained after cristallization in a 1:1 mixture of ethanol and water.
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