(2’R,5R,8R,10R,11R,13S,14S)-18-amino-11-hydroxy-10,13-dimethyl-3,5′-dioxo-2,3,4′,5,5′,6,7,8,9,10,11,12,13,14,15,16-hexadecahydro-1H,3’H-spiro[4,7-(metheno)cyclopenta[a]phenanthrene-17,2′-furan]-5-carbonitrile