Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 4psi_D.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): ASP 5.A N ASP 3.A O no hydrogen 3.200 N/A GLU 6.A N ASP 4.A O no hydrogen 2.935 N/A