(4S,5R,6R)-5-Acetylamino-4-hydroxy-6-((1S,2R)-1,2,3-trihydroxy-propyl)-5,6-dihydro-4H-pyran-2-carboxylic acid 2-Deoxy-2,3-dehydro-N-acetylneuraminic acid AIDS-121725 AIDS121725