Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 6f09_A.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): SER 3.A OG PRO 4.A O SER 3.A HG 2.780 1.984