6,11-Epoxy-12H-cyclopent[5,6]oxocino[3,2-c][1]benzopyran-12-one,6,7,7a,8,9,10,10a,11-octahydro-6-(3-hydroxy-3-methyl-1-butenyl)-4,7,10-trimethyl-,[6R-(6a,7b,7ab,10b,10ab,11a)]-