(4S,4aR,6aS,6aS,6bR,8aS,10S,12aS,14bR)-4,10-dihydroxy-2,4a,6a,6b,9,9,1 2a-heptamethyl-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicen e-2-carboxylic acid