(6aR,6bS,8aR,9R,11aS,11bS)-6a,8a-dimethyl-9-[(2R)-6-methylheptan-2-yl]-1,2,3,5,6,6a,6b,7,8,8a,9,10,11,11a,11b,12-hexadecahydroindeno[5,4-f]pyrimido[1,2-a]quinoline