1,4-ethano-1H-naphtho[2,3-c]pyran-6,9-dione, 3,4,10,10a-tetrahydro-3,8-dimethoxy-10a-methyl-, (1R,3R,4S,10aS)- Auxemim InChI=1/C18H20O5/c1-18-8-11-10(13(19)7-14(21-2)16(11)20)6-12(18)9-4-5-15(18)23-17(9)22-3/h6-7,9,15,17H,4-5,8H2,1-3H3/t9-,15+,17+,18-/m0/s rel-(1R,4S,9aS,11R)-7,11-dimethoxy-9a-methyl-1,2,3,4,9,9a-hexahydro-1,4-(epoxymethano)anthracene-5,8-dione rel-8alpha,11beta-Epoxy-2,11-dimethoxy-8abeta-methyl-5,6,7,8,8a,9-hexahydro-1,4-anthracenedione