2-(Acetylamino)-2-deoxy-L-galacturonic acid 2-N-Acetyl-2-deoxy-L-galacturonic acid 2-N-Acetyl-2-deoxygalacturonic acid 2-Nadga 82838-35-5 Galnaca L-Galacturonic acid, 2-(acetylamino)-2-deoxy- N-Acetylgalactosaminuronic acid