112154-63-9 5,7-Diacetamido-3,5,7,9-tetradeoxy-glycerogalacto-nonulosonic acid 5,7-Diacetamido-tggn 5,7-Diacetylamino-3,5,7,9-tetradeoxy-D-glycero-L-galacto-nonulosonic acid