Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 3fqn_C.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): SER 4.A N.B ASP 3.A OD1.A no hydrogen 2.371 N/A