1,4a,7-Trimethyl-7-vinyl-1,2,3,4,4a,4b,5,6,7,8,10,10a-dodecahydrophenanthrene-1-carboxylic acid

1,4a,7-Trimethyl-7-vinyl-1,2,3,4,4a,4b,5,6,7,8,10,10a-dodecahydrophenanthrene-1-carboxylic acid

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The title compound, also Cat known as isopimaric acid, C20H30O2, was isolated from slash pine rosin.There are two unique molecules in the unit cell.The two cyclohexane rings have classical chair conformations.The cyclohexene ring represents a semi-chair.The molecular conformation is stabilized by weak intramolecular C—H.

O hydrogen-bonding interactions.The molecules are Back Pad dimerized through their carboxyl groups by O—H.O hydrogen bonds, forming R22(8) rings.