[7,7'-Bi-4aH-xanthene]-4a,4'a-dicarboxylicacid,2,2',3,3',4,4',9,9'-octahydro-1,1',8,8'-tetrahydroxy-3,3'-dimethyl-9,9'-dioxo-4,4'-bis[(tetrahydro-2H-pyran-2-yl)oxy]-,dimethyl ester, [3S-[3a,4b,4ab,7(3'R*,4'S*,4'aS*)]]-;Bis(tetrahydro-2H-pyran-2-yl)secalonic acid D