(4’R,8S,9S,10R,11S,13S,14S)-2′-butyl-11-hydroxy-2′-methoxy-10,13-dimethyl-1,6,7,8,9,10,11,12,13,14,15,16-dodecahydrospiro[cyclopenta[a]phenanthrene-17,4′-[1,3]dioxane]-3,5′(2H)-dione