OPSIN: Open Parser for Systematic IUPAC nomenclature

Updated 2018-02-28: This webservice is now using HTTPS
If you have found OPSIN useful in your work citing our paper would be very much appreciated. Depiction courtesy of the Indigo Toolkit

Enter a chemical name into the box and then click submit.
The chemical structure described by the name, or why it could not be interpreted, will appear here.