Molecular docking of ligands with RhlR receptor protein from P. aeruginosa PAO1 showing the key hydrophobic and polar interactions of a C4—HSL b 3-Isobutylhexahydropyrrolo[1,2-a]pyrazine-1,4-dione c 1,2-benzenedicarboxylic acid, bis(2-methylpropyl) ester d Sulfurous acid, 2-propyl tridecyl ester