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

1C2-HYDROXY-COELENTERAZINE
28-BENZYL-2-HYDROXY-2-(4-HYDROXY-BENZYL)-6-(4-HYDROXY-PHENYL)-2H-IMIDAZO[1,2-A]PYRAZIN-3-ONE