Benz[a]anthracene-1,7,12(2H)-trione,9-[[2',3-anhydro]-2,6-dideoxy-4-O-(3,6-dideoxy-a-L-erythro-hexopyranos-4-ulos-1-yl)-b-D-arabino-hexopyranosyl]-3,4,4a,12b-tetrahydro-4a,8,12b-trihydroxy-3-methyl-3-[[tetrahydro-6-methyl-5-[(tetrahydro-6-methyl-5-oxo-2H-pyran-2-yl)oxy]-2H-pyran-2-yl]oxy]-,[2S-[2a(3S*,4aS*,12bR*),5b(2S*,6R*),6b]]-; 2H,7H-Dipyrano[2,3-b:4',3'-e][1,4]dioxin,benz[a]anthracene-1,7,12(2H)-trione deriv.; Saquayamycin D