5a,11a-Epoxy-5H-furo(3,2-b)naphtho(2,3-d)pyran-2,6,11(3H)-trione, 8-(3,3a,5,6,11,11b-hexahydro-10-hydroxy-5-methyl-2,6,11-trioxo-2H-furo(3,2-b)naphtho(2,3-d)pyran-8-yl)-3a,11b-dihydro-10-hydroxy-5-methyl-