OPSIN: Open Parser for Systematic IUPAC nomenclature

Updated 2024-01-28: Redirect API requests with no parameters to instructions page
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.