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 known as isopimaric acid, C20H30O2, was isolated from slash pine Dabbers 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 dimerized through their Heart Plaque LED Night Light carboxyl groups by O—H.O hydrogen bonds, forming R22(8) rings.