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