2H-Phenanthro[1,10a-b]oxirene-2,9(5H)-dione,3-ethenyl-3,3a,6,6a,7,8,10,10a-octahydro-8-hydroxy-3,7,7,10a-tetramethyl-,[3R-(3a,3ab,4aR*,6ab,8a,10aa)]-