The structures of new antifungal antibiotics, benanomicins A and B.

Abstract
Structures of new antifungal antibiotics, benanomicins A and B were determined to be N-[[5-[6-deoxy-3-O-(.beta.-D-xylopyranosyl)-.beta.-D-galactopyranosyloxy]-5,6-dihydro-1,6,9,14-tetrahydroxy-11-methoxy-3-methyl-8,13-dioxobenzo[a]naphthacen-2-yl]carbonyl]-D-alanine and N-[[5-[4-amino-4,6-dideoxy-3-O-(.beta.-D-xylopyranosyl)-.beta.-D-galactopyranosyloxy]-5,6-dihydro-1,6,9,14-tetrahydroxy-11-methoxy-3-methyl-8,13-dioxobenzo[a]naphthacen-2-yl]carbonyl]-D-alanine, respectively, by spectral analyses and chemical degradation studies.