[chengqianwei@localhost test2]$ gmx pdb2gmx -f formic-acid.pdb -ter :-) GROMACS - gmx pdb2gmx, VERSION 5.1.4 (-: GROMACS is written by: Emile Apol Rossen Apostolov Herman J.C. Berendsen Par Bjelkmar Aldert van Buuren Rudi van Drunen Anton Feenstra Sebastian Fritsch Gerrit Groenhof Christoph Junghans Anca Hamuraru Vincent Hindriksen Dimitrios Karkoulis Peter Kasson Jiri Kraus Carsten Kutzner Per Larsson Justin A. Lemkul Magnus Lundborg Pieter Meulenhoff Erik Marklund Teemu Murtola Szilard Pall Sander Pronk Roland Schulz Alexey Shvetsov Michael Shirts Alfons Sijbers Peter Tieleman Teemu Virolainen Christian Wennberg Maarten Wolf and the project leaders: Mark Abraham, Berk Hess, Erik Lindahl, and David van der Spoel Copyright (c) 1991-2000, University of Groningen, The Netherlands. Copyright (c) 2001-2015, The GROMACS development team at Uppsala University, Stockholm University and the Royal Institute of Technology, Sweden. check out http://www.gromacs.org for more information. GROMACS is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. GROMACS: gmx pdb2gmx, VERSION 5.1.4 Executable: /usr/local/gromacs/bin/gmx Data prefix: /usr/local/gromacs Command line: gmx pdb2gmx -f formic-acid.pdb -ter Select the Force Field: From '/usr/local/gromacs/share/gromacs/top': 1: AMBER03 protein, nucleic AMBER94 (Duan et al., J. Comp. Chem. 24, 1999-2012, 2003) 2: AMBER94 force field (Cornell et al., JACS 117, 5179-5197, 1995) 3: AMBER96 protein, nucleic AMBER94 (Kollman et al., Acc. Chem. Res. 29, 461-469, 1996) 4: AMBER99 protein, nucleic AMBER94 (Wang et al., J. Comp. Chem. 21, 1049-1074, 2000) 5: AMBER99SB protein, nucleic AMBER94 (Hornak et al., Proteins 65, 712-725, 2006) 6: AMBER99SB-ILDN protein, nucleic AMBER94 (Lindorff-Larsen et al., Proteins 78, 1950-58, 2010) 7: AMBERGS force field (Garcia & Sanbonmatsu, PNAS 99, 2782-2787, 2002) 8: CHARMM27 all-atom force field (CHARM22 plus CMAP for proteins) 9: CHARMM36 all-atom force field (November 2018) 10: GROMOS96 43a1 force field 11: GROMOS96 43a2 force field (improved alkane dihedrals) 12: GROMOS96 45a3 force field (Schuler JCC 2001 22 1205) 13: GROMOS96 53a5 force field (JCC 2004 vol 25 pag 1656) 14: GROMOS96 53a6 force field (JCC 2004 vol 25 pag 1656) 15: GROMOS96 54a7 force field (Eur. Biophys. J. (2011), 40,, 843-856, DOI: 10.1007/s00249-011-0700-9) 16: OPLS-AA/L all-atom force field (2001 aminoacid dihedrals) 9 Using the Charmm36-nov2018 force field in directory charmm36-nov2018.ff Opening force field file /usr/local/gromacs/share/gromacs/top/charmm36-nov2018.ff/watermodels.dat Select the Water Model: 1: TIP3P TIP 3-point, recommended, by default uses CHARMM TIP3 with LJ on H 2: TIP4P TIP 4-point 3: TIP5P TIP 5-point 4: SPC simple point charge 5: SPC/E extended simple point charge 6: None 6 Opening force field file /usr/local/gromacs/share/gromacs/top/charmm36-nov2018.ff/merged.r2b Reading formic-acid.pdb... Read 5 atoms Analyzing pdb file Splitting chemical chains based on TER records or chain id changing. There are 1 chains and 0 blocks of water and 1 residues with 5 atoms chain #res #atoms 1 'X' 1 5 All occupancy fields zero. This is probably not an X-Ray structure Opening force field file /usr/local/gromacs/share/gromacs/top/charmm36-nov2018.ff/atomtypes.atp Atomtype 447 Reading residue database... (charmm36-nov2018) Opening force field file /usr/local/gromacs/share/gromacs/top/charmm36-nov2018.ff/merged.rtp Residue 1318 Sorting it all out... Opening force field file /usr/local/gromacs/share/gromacs/top/charmm36-nov2018.ff/merged.hdb Opening force field file /usr/local/gromacs/share/gromacs/top/charmm36-nov2018.ff/merged.n.tdb Opening force field file /usr/local/gromacs/share/gromacs/top/charmm36-nov2018.ff/merged.c.tdb Back Off! I just backed up topol.top to ./#topol.top.1# Processing chain 1 'X' (5 atoms, 1 residues) Warning: Starting residue FORH1 in chain not identified as Protein/RNA/DNA. Problem with chain definition, or missing terminal residues. This chain does not appear to contain a recognized chain molecule. If this is incorrect, you can edit residuetypes.dat to modify the behavior. 8 out of 8 lines of specbond.dat converted successfully Opening force field file /usr/local/gromacs/share/gromacs/top/charmm36-nov2018.ff/merged.arn ------------------------------------------------------- Program gmx pdb2gmx, VERSION 5.1.4 Source code file: /home/chengqianwei/program/gromacs-5.1.4/src/gromacs/gmxpreprocess/pdb2gmx.c, line: 746 Fatal error: Atom HN in residue FORH 1 was not found in rtp entry FORH with 5 atoms while sorting atoms. For a hydrogen, this can be a different protonation state, or it might have had a different number in the PDB file and was rebuilt (it might for instance have been H3, and we only expected H1 & H2). Note that hydrogens might have been added to the entry for the N-terminus. Remove this hydrogen or choose a different protonation state to solve it. Option -ignh will ignore all hydrogens in the input. For more information and tips for troubleshooting, please check the GROMACS website at http://www.gromacs.org/Documentation/Errors -------------------------------------------------------