(8S,13S,14S,17S)-13-methyl-17-(prop-1-yn-1-yl)-1,2,4,5,6,7,8,10,12,13,14,15,16,17-tetradecahydrospiro[cyclopenta[a]phenanthrene-3,2′-[1,3]dioxolane]-5,10,17-triol