Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 7b7u_N.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): UNK 19.A N UNK 17.A O no hydrogen 2.889 N/A UNK 27.A N UNK 24.A O no hydrogen 3.233 N/A