498 CYS  SG    501 CYS  SG      3.55
498 CYS  SG    518 CYS  SG      3.55
498 CYS  SG    514 HIS  NE2     3.25
501 CYS  SG    518 CYS  SG      3.55
501 CYS  SG    514 HIS  NE2     3.25
518 CYS  SG    514 HIS  NE2     3.25