Name

obabel -- a converter for chemistry and molecular modeling data files

Synopsis

obabel [-H help-options]
obabel [OPTIONS] [-i input-type | -: "SMILES-string"] infile [-o output-type] -O outfile

Description

obabel is a cross-platform program designed to interconvert between many file formats used in molecular modeling and computational chemistry and related areas.

Open Babel is also a complete programmers toolkit for developing chemistry software. For more information, se the Open Babel web pages <http://openbabel.org/>.

Options

If only input and output files are given, Open Babel will guess the file type from the filename extension.

-a options

Format-specific input options. See -H format-ID for options allowed by a particular format

--addtotitle

Append text to the current molecule title

--addformula

Append the molecular formula after the current molecule title

-b

Convert dative bonds: e.g., [N+]([O-])=O to N(=O)=O

-c

Center atomic coordinates at (0,0,0)

-C

Combine molecules in first file with others having the same name

-e

Continue after errors

-d

Delete Hydrogens

---errorlevel 2

Filter the level of errors and warnings displayed: 1 = critical errors only 2 = include warnings too (default) 3 = include informational messages too 4 = include “audit log” messages of changes to data 5 = include debugging messages too

-f #

For multiple entry input, start import with molecule # as the first entry

-F

Output the available fingerprint types

-h

Add hydrogens

-H

Output usage information

-H format-ID

Output formatting information and options for format specified

-Hall

Output formatting information and options for all formats

-i<format-ID>

Specifies input format, see below for the available formats

-j

--join

Join all input molecules into a single output molecule entry

-k

Translate computational chemistry modeling keywords (e.g., GAMESS and Gaussian)

-m

Produce multiple output files, to allow:

-

Splitting one input file - put each molecule into consecutively numbered output files

-

Batch conversion - convert each of multiple input files into a specified output format

-l #

For multiple entry input, stop import with molecule # as the last entry

-o format-ID

Specifies output format, see below for the available formats

-p

Add Hydrogens appropriate for pH (use transforms in phmodel.txt)

--property

Add or replace a property (e.g., in an MDL SD file)

-s SMARTS

Convert only molecules matching the SMARTS pattern specified

--separate

Separate disconnected fragments into individual molecular records

-t

All input files describe a single molecule

--title title

Add or replace molecular title

-x options

Format-specific output options. See -H format-ID for options allowed by a particular format

-v SMARTS

Convert only molecules NOT matching SMARTS pattern specified

-V

Output version number and exit

-z

Compress the output with gzip

File Formats

The following formats are currently supported by Open Babel:

• acr -- Carine ASCI Crystal
• alc -- Alchemy format
• arc -- Accelrys/MSI Biosym/Insight II CAR format [Read-only]
• bgf -- MSI BGF format
• box -- Dock 3.5 Box format
• bs -- Ball and Stick format
• c3d1 -- Chem3D Cartesian 1 format
• c3d2 -- Chem3D Cartesian 2 format
• caccrt -- Cacao Cartesian format
• cache -- CAChe MolStruct format [Write-only]
• cacint -- Cacao Internal format [Write-only]
• can -- Canonical SMILES format
• car -- Accelrys/MSI Biosym/Insight II CAR format [Read-only]
• ccc -- CCC format [Read-only]
• cdx -- ChemDraw binary format [Read-only]
• cdxml -- ChemDraw CDXML format
• cht -- Chemtool format [Write-only]
• cif -- Crystallographic Information File
• cml -- Chemical Markup Language
• cmlr -- CML Reaction format
• com -- Gaussian Cartesian Input [Write-only]
• copy -- Copies raw text [Write-only]
• crk2d -- Chemical Resource Kit 2D diagram format
• crk3d -- Chemical Resource Kit 3D format
• csr -- Accelrys/MSI Quanta CSR format [Write-only]
• cssr -- CSD CSSR format [Write-only]
• ct -- ChemDraw Connection Table format
• dmol -- DMol3 coordinates format
• ent -- Protein Data Bank format
• fa -- FASTA format [Write-only]
• fasta -- FASTA format [Write-only]
• fch -- Gaussian formatted checkpoint file format [Read-only]
• fchk -- Gaussian formatted checkpoint file format [Read-only]
• fck -- Gaussian formatted checkpoint file format [Read-only]
• feat -- Feature format
• fh -- Fenske-Hall Z-Matrix format [Write-only]
• fix -- SMILES FIX format [Write-only]
• fpt -- Fingerprint format [Write-only]
• fract -- Free Form Fractional format
• fs -- Open Babel FastSearching database
• fsa -- FASTA format [Write-only]
• g03 -- Gaussian 98/03 Output [Read-only]
• g98 -- Gaussian 98/03 Output [Read-only]
• gam -- GAMESS Output [Read-only]
• gamin -- GAMESS Input [Write-only]
• gamout -- GAMESS Output [Read-only]
• gau -- Gaussian Cartesian Input [Write-only]
• gjc -- Gaussian Cartesian Input [Write-only]
• gjf -- Gaussian Cartesian Input [Write-only]
• gpr -- Ghemical format
• gr96 -- GROMOS96 format [Write-only]
• gzmat -- Gaussian Z-Matrix Input
• hin -- HyperChem HIN format
• inchi -- IUPAC InChI [Write-only]
• inp -- GAMESS Input [Write-only]
• ins -- ShelX format [Read-only]
• jin -- Jaguar input format [Write-only]
• jout -- Jaguar output format [Read-only]
• mdl -- MDL MOL format
• mmd -- MacroModel format
• mmod -- MacroModel format
• mol -- MDL MOL format
• mol2 -- Sybyl Mol2 format
• molreport -- Open Babel molecule report [Write-only]
• moo -- MOPAC Output format [Read-only]
• mop -- MOPAC Cartesian format
• mopcrt -- MOPAC Cartesian format
• mopin -- MOPAC Internal
• mopout -- MOPAC Output format [Read-only]
• mpc -- MOPAC Cartesian format
• mpd -- Sybyl descriptor format [Write-only]
• mpqc -- MPQC output format [Read-only]
• mpqcin -- MPQC simplified input format [Write-only]
• nw -- NWChem input format [Write-only]
• nwo -- NWChem output format [Read-only]
• pc -- PubChem format [Read-only]
• pcm -- PCModel format
• pdb -- Protein Data Bank format
• pov -- POV-Ray input format [Write-only]
• pqs -- Parallel Quantum Solutions format
• prep -- Amber Prep format [Read-only]
• qcin -- Q-Chem input format [Write-only]
• qcout -- Q-Chem output format [Read-only]
• report -- Open Babel report format [Write-only]
• res -- ShelX format [Read-only]
• rxn -- MDL RXN format
• sd -- MDL MOL format
• sdf -- MDL MOL format
• smi -- SMILES format
• sy2 -- Sybyl Mol2 format
• tdd -- Thermo format
• test -- Test format [Write-only]
• therm -- Thermo format
• tmol -- TurboMole Coordinate format
• txyz -- Tinker MM2 format [Write-only]
• unixyz -- UniChem XYZ format
• vmol -- ViewMol format
• xed -- XED format [Write-only]
• xml -- General XML format [Read-only]
• xyz -- XYZ cartesian coordinates format
• yob -- YASARA.org YOB format
• zin -- ZINDO input format [Write-only]

Format Options

Individual file formats may have additional formatting options.

Input format options are preceded by ‘a’, e.g. -as

Output format options are preceded by ‘x’, e.g. -xn

For further specific information and options, use -H<format-type> e.g., -Hcml

Examples

Standard conversion:

obabel ethanol.xyz -Oethanol.pdb

obabel -ismi -omol2

obabel infile.mol -Onew.smi -m

See Also

obenergy(1) , obfit(1) , obgrep(1) , obminimize(1) , obprop(1) , obrotate(1) , obrotamer(1) .

The web pages for Open Babel can be found at: <http://openbabel.org/>

More details on the formats supported by Open Babel can be found at: <http://openbabel.org/wiki/Formats>

Authors

A cast of many, including the currrent maintainers Geoff Hutchison, Chris Morley, Michael Banck, and innumerable others who have contributed fixes and additions. For more contributors to Open Babel, see <http://openbabel.org/wiki/THANKS>

Copyright

Copyright (C) 1998-2001 by OpenEye Scientific Software, Inc.
Some portions Copyright (C) 2001-2007 by Geoffrey R. Hutchison

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation version 2 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

Table of Contents

• Name
• Synopsis
• Description
• Options
• File Formats
• Format Options
• Examples
• See Also
• Authors
• Copyright