115834-23-6 Antibiotic SF 2446A1 Benzo(a)naphthacene-2-carboxylic acid, 11-((6-deoxy-2,4-di-O-methyl-beta-L-mannopyranosyl)amino)-5,6,6a,7,9,12,14,14a-octahydro-1,6,8,14a-tetrahydroxy-6a-methoxy-3-methyl-7,9,12,14-tetraoxo-, methyl ester, (6-alpha,6a-beta,14a-beta)- SF 2446A1