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Open Babel: an Open Chemical Toolbox Noel M O’Boyle1, Michael Banck2, Craig a James3, Chris Morley4, Tim Vandermeersch4 and Geoffrey R Hutchison5*

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Open Babel: an Open Chemical Toolbox Noel M O’Boyle1, Michael Banck2, Craig a James3, Chris Morley4, Tim Vandermeersch4 and Geoffrey R Hutchison5* O’Boyle et al. Journal of Cheminformatics 2011, 3:33 http://www.jcheminf.com/content/3/1/33 SOFTWARE Open Access Open Babel: An open chemical toolbox Noel M O’Boyle1, Michael Banck2, Craig A James3, Chris Morley4, Tim Vandermeersch4 and Geoffrey R Hutchison5* Abstract Background: A frequent problem in computational modeling is the interconversion of chemical structures between different formats. While standard interchange formats exist (for example, Chemical Markup Language) and de facto standards have arisen (for example, SMILES format), the need to interconvert formats is a continuing problem due to the multitude of different application areas for chemistry data, differences in the data stored by different formats (0D versus 3D, for example), and competition between software along with a lack of vendor- neutral formats. Results: We discuss, for the first time, Open Babel, an open-source chemical toolbox that speaks the many languages of chemical data. Open Babel version 2.3 interconverts over 110 formats. The need to represent such a wide variety of chemical and molecular data requires a library that implements a wide range of cheminformatics algorithms, from partial charge assignment and aromaticity detection, to bond order perception and canonicalization. We detail the implementation of Open Babel, describe key advances in the 2.3 release, and outline a variety of uses both in terms of software products and scientific research, including applications far beyond simple format interconversion. Conclusions: Open Babel presents a solution to the proliferation of multiple chemical file formats. In addition, it provides a variety of useful utilities from conformer searching and 2D depiction, to filtering, batch conversion, and substructure and similarity searching. For developers, it can be used as a programming library to handle chemical data in areas such as organic chemistry, drug design, materials science, and computational chemistry. It is freely available under an open-source license from http://openbabel.org. Introduction indication of biomolecular residues, or multiple The history of chemical informatics has included a huge conformations. variety of textual and computer representations of mole- While attempts have been made to provide a standard cular data. Such representations focus on specific atomic format for storing chemical data, including most notably or molecular information and may not attempt to store the development of Chemical Markup Language (CML) all possible chemical data. For example, line notations [2-6], an XML dialect, such formats have not yet like Daylight SMILES [1] do not offer coordinate infor- achieved widespread use. Consequently, a frequent pro- mation, while crystallographic or quantum mechanical blem in computational modeling is the interconversion formats frequently do not store chemical bonding data. of molecular structures between different formats, a pro- Hydrogen atoms are frequently omitted from x-ray crys- cess that involves extraction and interpretation of their tallography due to the difficulty in establishing coordi- chemical data and semantics. nates, and are often ignored by some file formats as the We outline for the first time, the development and use “implicit valence” of heavy atoms that indicates their of the Open Babel project, a full-featured open chemical presence. Other types of representations require specifi- toolbox, designed to “speak” themanydifferentrepre- cation of atom types on the basis of a specific valence sentations of chemical data. It allows anyone to search, bond model, inclusion of computed partial charges, convert, analyze, or store data from molecular modeling, chemistry, solid-state materials, biochemistry, or related areas. It provides both ready-to-use programs as well as * Correspondence: [email protected] ’ 5University of Pittsburgh, Department of Chemistry, 219 Parkman Avenue, a complete, extensible programmer s toolkit for develop- Pittsburgh, PA 15217, USA ing cheminformatics software. It can handle reading, Full list of author information is available at the end of the article © 2011 O’Boyle et al; licensee Chemistry Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. O’Boyle et al. Journal of Cheminformatics 2011, 3:33 Page 2 of 14 http://www.jcheminf.com/content/3/1/33 writing, and interconverting over 110 chemical file for- substructure searching (see below); the MolPrint2D and mats, supports filtering and searching molecule files Multilevel Neighborhoods of Atoms formats calculate cir- using Daylight SMARTS pattern matching [7] and other cular fingerprints defined by Bender et al. [15,16] and methods, and provides extensible fingerprinting and Filimonov et al. [17,18] respectively. molecular mechanics frameworks. We will discuss the Each format can have multiple options to control frameworks for file format interconversion, fingerprint- either reading or writing a particular format. For exam- ing, fast molecular searching, bond perception and atom ple, the InChI format has 12 options including an typing, canonical numbering of molecular structures and option “K” to generate an InChIKey, “T<param>“ to fragments, molecular mechanics force fields, and the truncate the InChI depending on a supplied parameter extensible interfaces provided by the software library to and “w” to ignore certain InChI warnings. The available enable further chemistry software development. options are listed in the documentation, are shown in Open Babel has its origin in a version of OELib the Graphical User Interface (GUI) as checkboxes or released as open-source software by OpenEye Scientific textboxes, and can be listed at the command-line. In under the GPL (GNU Public License). In 2001, OpenEye fact, all three are generated from the same source; a decided to rewrite OELib in-house as the proprietary documentation string in the C++ code. OEChem library, so the existing code from OELib was spun out into the new Open Babel project. Since 2001, Fingerprints and Fast Searching Open Babel has been developed and substantially Databases are widely used to store chemical information extended as an international collaborative project using especially in the pharmaceutical industry. A key require- an open-source development model [8]. It has over ment of such a database is the ability to index chemical 160,000 downloads, over 400 citations [9], is used by structures so that they can be quickly retrieved given a over 40 software projects [10], and is freely available query substructure. Open Babel provides this functional- from the Open Babel website [11]. ity using a path-based fingerprint. This fingerprint, referred to as FP2 in Open Babel, identifies all linear Features and ring substructures in the molecule of lengths 1 to 7 File Format Support (excluding the 1-atom substructures C and N) and maps With the release of Open Babel 2.3, Open Babel sup- them onto a bit-string of length 1024 using a hash func- ports 111 chemical file formats in total. It can read 82 tion. If a query molecule is a substructure of a target formats and write 85 formats. These encompass com- molecule, then all of the bits set in the query molecule mon formats used in cheminformatics (SMILES, InChI, will also be set in the target molecule. The fingerprints MOL, MOL2), input and output files from a variety of for two molecules can also be used to calculate struc- computational chemistry packages (GAMESS, Gaussian, tural similarity using the Tanimoto coefficient, the num- MOPAC), crystallographic file formats (CIF, ShelX), ber of bits in common divided by the union of the bits reaction formats (MDL RXN), file formats used by set. molecular dynamics and docking packages (AutoDock, Clearly, repeated searching of the same set of mole- Amber), formats used by 2D drawing packages (Chem- cules will involve repeated use of the same set of finger- Draw), 3D viewers (Chem3D, Molden) and chemical prints. To avoid the need to recalculate the fingerprints kinetics and thermodynamics (ChemKin, Thermo). For- for a particular multi-molecule file (such as an SDF file), mats are implemented as “plugins” in Open Babel, Open Babel provides a fastindex format that solely which makes it easy for users to contribute new file for- stores a fingerprint along with an index into the original mats (see Extensible Interface below). Depending on the file. This index leads to a rapid increase in the speed of format, other data is extracted by Open Babel in addi- searching for matches to a query - datasets with several tion to the molecular structure; for example, vibrational million molecules are easily searched interactively. In frequencies are extracted from computational chemistry thisway,amulti-moleculefilemaybeusedasalight- log files, unit cell information is extracted from CIF weight alternative to a chemical database system. files, and property fields are read from SDF files. Anumberof“utility” file formats are also defined; Bond Perception and Atom Typing these are not strictly speaking a way of storing the As mentioned above, many chemical file formats offer molecular structure, but rather present certain function- representations of molecular data solely as lists of ality through the same interface as the regular file for- atoms. For example, most quantum chemical software mats. For example,
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