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.

May, 22nd, 2016: Due to specific problems with newer Java releases, we cannot provide a working online tool for all set-ups right now. We try to find a solution. Meanwhile you can download the Data Warrior, which calculates similar values and helps you to manage a huge amount of molecules. Please find a tutorial here and the download here.

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

Specific information on individual properties may be found here: