sentence: Compound A36 also displayed pi-donor hydrogen bond formation with Trp64 , Tyr25 and Tyr157 and pi-cation bond formation with Lys283.Compound A65 was also found to be docked in the binding groove of BioA-SFG and was surrounded by the residues Phe402 , Arg400 , Arg403 , Tyr25 , Trp65 , Trp64 , Val383 and Leu385 .