(3S,5S,8S,9S,10R,13R,14S,17R)-3-bromo-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]hexadecahydrospiro[cyclopenta[a]phenanthrene-6,2'-[1,3]dithiolane] 1',1',3',3'-tetraoxide