Saturday 19 January 2013

Chemistrify your Raspberry Pi Part III

Following on from Parts I and II, now for the chemistry bit. It turns out this is the easiest part:
apt-get install python-cinfony python-imaging python-imaging-tk openbabel openbabel-gui indigo-utils python-chemfp python-cclib gausssum pymol jmol rasmol avogadro
Pretty easy huh? A single line install for 13 or so chemistry packages. Note that this install command should work on any other Linux distribution based on Debian (e.g. Linux Mint or Ubuntu).

Specifically, this installs Cinfony 1.1 and all its dependencies (Open Babel, RDKit, CDK, Indigo, OPSIN). Then there's Andrew Dalke's chemfp. Not to mention the 'mols' (Jmol, PyMol, Rasmol) and Avogadro. And let's not forget shameless self-promotion of cclib and GaussSum.

After installation here are some examples of things you could do:
$ obabel -:"CC(=O)Cl" -O testOB.png
$ indigo-depict - "CC(=O)Cl" testIndigo.png
$ gpicview test*.png # Display images
$ obgui   # Runs fine
$ obabel -:"CC(=O)Cl MyMol" -O tmp.mol --gen2d
$ ob2fps tmp.mol # Run ChemFP
$ wget
$ pymol 1PTQ.pdb  # Fails to start (no OpenGL GLX extension on RPi)
$ rasmol 1PTQ.pdb # Runs fine
$ jmol 1PTQ.pdb   # Runs fine
$ avogadro        # Fails to start (OpenGL problem)
$ cclib-get --list mycompchemfile.log
$ gausssum
To use Cinfony, you need to set some variables first as the Java parts don't work out-of-the-box:
$ export JPYPE_JVM=/usr/lib/jvm/java-6-openjdk-armhf/jre/lib/arm/server/
$ export CLASSPATH=/usr/share/java/cdk-nonotify.jar:/usr/share/java/cdk-io.jar:/usr/share/java/cdk-formula.jar:/usr/share/java/cdk-forcefield.jar:/usr/share/java/cdk-atomtype.jar:/usr/share/java/cdk-pdb.jar:/usr/share/java/cdk-fingerprint.jar:/usr/share/java/cdk-qsar.jar:/usr/share/java/cdk-ionpot.jar:/usr/share/java/cdk-annotation.jar:/usr/share/java/cdk-builder3d.jar:/usr/share/java/cdk-libiocml.jar:/usr/share/java/cdk-libiomd.jar:/usr/share/java/cdk-pcore.jar:/usr/share/java/cdk-ioformats.jar:/usr/share/java/cdk-qsarmolecular.jar:/usr/share/java/cdk-qsaratomic.jar:/usr/share/java/cdk-valencycheck.jar:/usr/share/java/cdk-extra.jar:/usr/share/java/cdk-structgen.jar:/usr/share/java/cdk-dict.jar:/usr/share/java/cdk-smarts.jar:/usr/share/java/cdk-control.jar:/usr/share/java/cdk-render.jar:/usr/share/java/cdk-builder3dtools.jar:/usr/share/java/cdk-qsarprotein.jar:/usr/share/java/cdk-data.jar:/usr/share/java/cdk-charges.jar:/usr/share/java/cdk-qm.jar:/usr/share/java/cdk-qsarionpot.jar:/usr/share/java/cdk-standard.jar:/usr/share/java/cdk-interfaces.jar:/usr/share/java/cdk-core.jar:/usr/share/java/cdk-sdg.jar:/usr/share/java/cdk-isomorphism.jar:/usr/share/java/cdk-qsarbond.jar:/usr/share/java/cdk-reaction.jar:/usr/share/java/cdk-diff.jar:/usr/share/java/cdk-smiles.jar:/usr/share/java/jaxen.jar:/usr/share/java/opsin-1.2.0.jar:/usr/share/java/opsin.jar
$ python
>>> from cinfony import opsin, webel
>>> webel.readstring("name", "aspirin").write("iupac")
'2-acetyloxybenzoic acid'
>>> opsin.readstring("iupac", "2-acetyloxybenzoic acid").write("smi")
There are many other packages of interest; see under Science category in synaptic (see Notes below). Some examples include autodock, ballview, bkchem, and kalzium. Or to max out on chemistry just install the package science-chemistry.

(1) If using apt-get to install software is too hard-core for you, there's also a GUI called synaptic. To install, use "apt-get install synaptic".
(2) After installation, to actually see what has been installed, use "dpkg -L 'package-name'". For example, anything that was installed in /usr/bin is a new command.
(3) The list of CDK jars was created using the following Python script:
import glob

cdk = glob.glob("/usr/share/java/cdk-*.jar")
jar = [jar for jar in cdk if not jar.endswith("1.2.10.jar")]
print ":".join(jar)
(4) Compiling Open Babel oneself works fine but takes 3 or so hours. A similar experience for RDKit has been reported by Jan Holst Jensen.

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