108351-33-3 21-O-De(3-carboxy-1-oxo-2-propenyl)-23-deethyl-2-demethyl-21-O-(2,6-dideoxy-beta-D-arabino-hexopyranosyl)-2-methoxy-19-O-methyl-23-(1,3-pentadienyl)hygrolidin HS-6, N. Otitidiscaviarum HS-6, Nocardia Hygrolidin, 21-O-de(3-carboxy-1-oxo-2-propenyl)-23-deethyl-2-demethyl-21-O-(2,6-dideoxy-beta-D-arabino-hexopyranosyl)-2-methoxy-19-O-methyl-23-(1,3-pentadienyl)-