OPSIN: Open Parser for Systematic IUPAC nomenclature

Updated 2022-09-19: OPSIN's JSON API now returns JSON when an uninterpretable name is provided. Other APIs now return text return rather than HTML in this scenario
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.