Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 4wk2_C.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): SER 5.A OG ARG 2.A O SER 5.A HG 3.020 2.412