Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 3e1i_H.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): HIS 2.A N HIS 2.A ND1 no hydrogen 2.691 N/A ARG 3.A NH1 HIS 2.A O no hydrogen 3.135 N/A