The name/synonym for ligand NGA (curated from ChEBI, PubChem, and PDB databases):

1N-ACETYL-D-GALACTOSAMINE
2N-ACETYLGALACTOSAMINE
32-ACETAMIDO-2-DEOXY-D-GALACTOPYRANOSE
4D-GALNAC
5GALNAC
62-ACETAMIDO-2-DEOXY-D-GALACTOSE
7N-ACETYL-D-CHONDROSAMINE