Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 6xdr_Z.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): LEU 22.A N ASP 18.A O no hydrogen 2.829 N/A ALA 25.A N LEU 22.A O no hydrogen 3.457 N/A