The Infra-Red spectra showed the carbonyl of the acetyl groups in addition to the disappearance of the NH band. Their 1H NMR spectra showed the acetyl methyl signals, the sugar protons signals and the aromatic signals. The coupling constant value of the anomeric protons 9.8-10.2 Hz indicated that attachment of the sugar moiety is in the beta conformation leading to the formation of the
The Infra-Red spectra showed the carbonyl of the acetyl groups in addition to the disappearance of the NH band. Their 1H NMR spectra showed the acetyl methyl signals, the sugar protons signals and the aromatic signals. The coupling constant value of the anomeric protons 9.8-10.2 Hz indicated that attachment of the sugar moiety is in the beta conformation leading to the formation of the