11-methoxy-4,4,7a,10,10,13a,15b-heptamethyl-2,3,4,4a,5,7,7a,8,9,9a,10,11,12,13,13a,13b,14,15,15a,15b-icosahydro-1H-cyclohepta[1,2-a:5,4-a']dinaphthalen-3-ol