Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 6udr_A.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): ARG 2.A NE ASP 4.A OD1 ARG 2.A HE 2.766 1.913 ARG 2.A NH2 ASP 4.A OD1 ARG 2.A HH21 3.481 2.845 ARG 2.A NH2 ASP 4.A OD2 ARG 2.A HH21 2.884 2.078