Molecular models between the S. aureus monofunctional GT (protein PDB code: 3HZS) and isatin analogues was performed using AutoDock Vina.52 (link) All the 3D coordinates of isatin analogues were generated by ChemDraw Ultra 8.0 and energy minimized by Avogadro with Merck Molecular Force Field 94 (MMFF94).53 The protein PDB and ligands MOL2 files were handled by reported procedures.54 (link) The docking box contained the whole GT pocket.