Ligand Atom Receptor Atom Distance -- C 42 HIS CE1 A 62 HIS CE1 2.62 C 42 HIS CE1 A 123 SER O 2.63 C 37 PRO O A 97 SER O 2.67 C 40 GLY O A 62 HIS CD2 2.74 C 90 CYS O A 127 PRO CD 2.75 C 42 HIS CE1 A 62 HIS NE2 2.78 C 89 THR O A 128 SER OG 2.88 C 90 CYS O A 127 PRO CG 2.92 C 42 HIS NE2 A 94 LEU CD1 2.93 C 43 CYS O A 153 ASN CB 2.93 C 91 LEU CD1 A 128 SER CB 2.93 C 42 HIS ND1 A 215 SER OG 2.95