Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 8c30_PPP.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): ARG 4.A NE GLU 6.A OE1 no hydrogen 2.900 N/A ARG 4.A NH2 GLU 6.A OE1 no hydrogen 2.725 N/A ARG 4.A NH2 GLU 6.A OE2 no hydrogen 2.740 N/A