Synonyms: AngelmicinB; Hibarimicin B;1,5-Epoxynaphthacene-7,10,12(2H)-trione,2-[[(2R,5R,6S)-5-[[(2S,5R,6R)-5-acetyltetrahydro-5-hydroxy-6-methyl-2H-pyran-2-yl]oxy]tetrahydro-6-methyl-2H-pyran-2-yl]oxy]-9-[(6aR,7S,8R,9S,10S,10aS)-9-[[(2R,5R,6S)-5-[[(2S,5R,6R)-5-acetyltetrahydro-5-hydroxy-6-methyl-2H-pyran-2-yl]oxy]tetrahydro-6-methyl-2H-pyran-2-yl]oxy]-7-[(2,6-dideoxy-a-D-ribo-hexopyranosyl)oxy]-6,6a,7,8,9,10,10a,11-octahydro-1,8,10,10a,12-pentahydroxy-3,4-dimethoxy-11-oxo-10-propyl-2-naphthacenyl]-4-[(2,6-dideoxy-a-D-ribo-hexopyranosyl)oxy]-1,