Ligand Atom Receptor Atom Distance -- C 181 ALA O A 97 SER OG 2.64 C 89 THR OG1 A 62 HIS NE2 2.86 C 55 HIS NE2 A 205 GLY O 2.89 C 42 HIS NE2 A 198 ASN OD1 2.92 C 89 THR O A 153 ASN CG 2.99