METHYL(2R,4AS,6AS,12BR,14AS,14BR)-10-HYDROXY-2,4A,6A,9,12B,14A-HEXAMETHYL-11-OXO-1,2,3,4,4A,5,6,6A,11,12B,13,14,14A,14B-TETRADECAHYDROPICENE-2-CARBOXYLATE