GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  CHEMISTRY::FILE::SMILES (3)

.ds Aq ’

NAME

Chemistry::File::SMILES - SMILES linear notation parser/writer

CONTENTS

SYNOPSYS



    #!/usr/bin/perl
    use Chemistry::File::SMILES;

    # parse a SMILES string
    my $s = C1CC1(=O)[O-];
    my $mol = Chemistry::Mol->parse($s, format => smiles);

    # print a SMILES string
    print $mol->print(format => smiles);

    # print a unique (canonical) SMILES string
    print $mol->print(format => smiles, unique => 1);

    # parse a SMILES file
    my @mols = Chemistry::Mol->read("file.smi", format => smiles);

    # write a multiline SMILES file
    Chemistry::Mol->write("file.smi", mols => \@mols);



DESCRIPTION

This module parses a SMILES (Simplified Molecular Input Line Entry Specification) string. This is a File I/O driver for the PerlMol project. <http://www.perlmol.org/>. It registers the ’smiles’ format with Chemistry::Mol.

This parser interprets anything after whitespace as the molecule’s name; for example, when the following SMILES string is parsed, $mol->name will be set to Methyl chloride:



    CCl  Methyl chloride



The name is not included by default on output. However, if the name option is defined, the name will be included after the SMILES string, separated by a tab.



    print $mol->print(format => smiles, name => 1);



    Multiline SMILES and SMILES files

A file or string can contain multiple molecules, one per line.



    CCl  Methyl chloride
    CO   Methanol



Files with the extension ’.smi’ are assumed to have this format.

    Atom Mapping Numbers

As an extension for reaction processing, SMILES strings may have atom mapping numbers, which are introduced after a colon in a bracketed atom. For example, [C:1]. The mapping number need not be unique. This module reads the mapping numbers and stores them as the name of the atom ($atom->name).

On output, atom names are not included by default. See the number and auto_number options below for ways of including them.

head1 OPTIONS

The following options are supported in addition to the options mentioned for Chemistry::File, such as mol_class, format, and fatal.
aromatic On output, detect aromatic atoms and bonds by means of the Chemistry::Ring module, and represent the organic aromatic atoms with lowercase symbols.
unique When used on output, canonicalize the structure if it hasn’t been canonicalized already and generate a unique SMILES string. This option implies aromatic.
number For atoms that have a defined name, print the name as the atom number. For example, if an ethanol molecule has the name 42 for the oxygen atom and the other atoms have undefined names, the output would be:



    CC[OH:42]



auto_number When used on output, number all the atoms explicitly and sequentially. The output for ethanol would look something like this:



    [CH3:1][CH2:2][OH:3]



name Include the molecule name on output, as described in the previous section.
kekulize When used on input, assign single or double bond orders to aromatic or otherwise unspecified bonds (i.e., generate the Kekule structure). If false, the bond orders will remain single. This option is true by default. This uses assign_bond_orders from the Chemistry::Bond::Find module.

CAVEATS

Stereochemistry is not supported! Stereochemical descriptors such as @, @@, /, and \ will be silently ignored on input, and will certainly not be produced on output.

Reading branches that start before an atom, such as (OC)C, which should be equivalent to C(OC) and COC, according to some variants of the SMILES specification. Many other tools don’t implement this rule either.

The kekulize option works by increasing the bond orders of atoms that don’t have their usual valences satisfied. This may cause problems if you have atoms with explicitly low hydrogen counts.

VERSION

0.47

SEE ALSO

Chemistry::Mol, Chemistry::File

The SMILES Home Page at http://www.daylight.com/dayhtml/smiles/

The Daylight Theory Manual at http://www.daylight.com/dayhtml/doc/theory/theory.smiles.html

The PerlMol website <http://www.perlmol.org/>

AUTHOR

Ivan Tubert-Brohman <itub@cpan.org>

COPYRIGHT

Copyright (c) 2009 Ivan Tubert-Brohman. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
Search for    or go to Top of page |  Section 3 |  Main Index


perl v5.20.3 SMILES (3) 2010-07-08

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.