Ligand Atom Receptor Atom Distance -- C 42 HIS CE1 A 50 PHE CE1 2.50 C 42 HIS CE1 A 50 PHE CD1 2.61 C 42 HIS ND1 A 50 PHE CE1 2.82 C 116 ASP OD1 A 27 LYS CE 2.92