1H-Chryseno[2,1-b]pyran,2,3,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14,14a-octadecahydro-6a,6b,8a,11,11,14a-hexamethyl-,[6aS-(6aa,6bb,8aa,12aa,12ba,14aa)]-