(2R,3'S,3a'R,3a1'R,6a'R,7'S,11'S,11a'S)-1-acryloyl-7',11'-dihydroxy-5',5',8',8'-tetramethyldecahydro-2'H-spiro(aziridine-2,15'-(6a,11a)(epoxymethano)(3,3a1)ethanophenanthro(1,10-de)(1,3)dioxin)-14'-one
(2r,3's,3a'r,3a1'r,6a'r,7's,11's,11a's)-1-acryloyl-7',11'-dihydroxy-5',5',8',8'-tetramethyldecahydro-2'h-spiro(aziridine-2,15'-(6a,11a)(epoxymethano)(3,3a1)ethanophenanthro(1,10-de)(1,3)dioxin)-14'-one