The name/synonym for ligand 561 (curated from ChEBI, PubChem, and PDB databases):

16-HYDROXY-3-{(4R)-1-[4-(1-NAPHTHYLAMINO)-4-OXOBUTYL]-1,2,3-TRIAZOLIDIN-4-YL}-1-BENZOFURAN-5-CARBOXYLIC ACID