25644-83-1 Alanine, 3-[(2-acetamido-2-deoxy-.beta.-D-glucopyranosyl)oxy]-N-carboxy-, N-benzyl methyl ester, 3',4',6'-triacetate, L- L-Serine, N-[(phenylmethoxy)carbonyl]-O-[3,4,6-tri-O-acetyl-2-(acetylamino)-2-deoxy-.beta.-D-glucopyranosyl]-, methyl ester NSC173939