6-Methoxy-4,5-di(methoxycarbonyl)-2-(2,3,4-tri-O-acetyl-β-D-xylopyranosyl)aminopyridine and 4,5-Di(methoxycarbonyl)-6-methylthio-2-(2,3,4-tri-O-acetyl-β-D-xylopyranosyl)aminopyridine | Publicación