(4aS,6aS,6bR,8aS,10S,12aS,14aS,14bS)-10-hydroxy-2,2,6b,9,9,12a,14a-hep tamethyl-1,3,4,5,6a,7,8,8a,10,11,12,13,14,14b-tetradecahydropicene-4a- carboxylic acid