9,7-(Epoxymethano)-4H-oxireno(6,7)naphtho(2,1-c)pyran-4,11-dione, 2-(3-furanyl)-1,2,6,6a,7,7a,9,9a,9b-decahydro-7-hydroxy-6a,9b-dimethyl-, (2alpha,6aalpha,7alpha,7aalpha,8aalpha,9beta,9aalpha,9bbeta)-