Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 6q1x_A.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): CYS 16.A SG PHE 17.A O no hydrogen 3.889 N/A CYS 21.A N PHE 17.A O CYS 21.A H 3.237 2.504