(8S,9S,10R,11S,13S,14S,16S,17R)-17-hydroxy-10,13,16-trimethyl-17-(2-methyl-1,3-dioxolan-2-yl)-1,2,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydrospiro[cyclopenta[a]phenanthrene-3,2′-[1,3]dioxolan]-11-yl methanesulfonate