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In the title compound, C 30 H 46 O 3 , an isolation product of  Pistacia integerima Stewart , the five-membered ring is nearly in the envelope form. A 6-carb­oxy­hept-5-en-2-yl group is attached to the five-membered ring. An  S (6) ring motif is formed due to intra­molecular C—H⋯O hydrogen bonding. In the crystal, inter­molecular O—H⋯O hydrogen bonds form carboxyl­ate dimers with  R22 (8) ring motifs.

acta crystallographica. section e

2-Methyl-6-(4,4,10,13,14-pentamethyl-3-oxo-2,3,4,5,6,7,10,11,12,13,14,15,16,17-tetradecahydro-1<i>H</i>-cyclopenta[<i>a</i>]phenanthren-17-yl)hept-2-enoic acid

2-Methyl-6-(4,4,10,13,14-pentamethyl-3-oxo-2,3,4,5,6,7,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)hept-2-enoic acid