Organic Chemistry Portal
Tools >> Molecular Property Explorer

OSIRIS Property Explorer

The OSIRIS Property Explorer lets you draw chemical structures and calculates on-the-fly various drug-relevant properties whenever a structure is valid. Prediction results are valued and color coded. Properties with high risks of undesired effects like mutagenicity or a poor intestinal absorption are shown in red. Whereas a green color indicates drug-conform behaviour.

March 26th, 2014: Version 2 has been published. In certain cases, you must allow to run this applet - for example by clicking the "no entry" symbols. The updated version now predicts logP more accurately and converts SMILES strings and compound names into structures. If you can't access the tool, we recommend to download the newest version of JAVA using the Internet Explorer as browser. As soon as JAVA is installed, you can take any browser (Opera, FF) to use the applet again.

1) Thomas Sander, Actelion Pharmaceuticals Ltd., Gewerbestrasse 16, 4123 Allschwil, Switzerland, Email:

Specific information on individual properties may be found here: