opsin

Open Parser for Systematic IUPAC Nomenclature of chemical names

OPSIN (Open Parser for Systematic IUPAC Nomenclature) is a freely available, open-source Java library designed to accurately interpret systematic IUPAC chemical nomenclature and convert it into chemical structures. It offers high precision and recall for organic chemical names, including complex heterocycles and stereochemistry. OPSIN supports multiple output formats such as SMILES, InChI, and CML, and can also generate PNG, SVG, and JSON. It can be deployed as a web service, a local command-line application for bulk conversion, or integrated into other systems via third-party Python libraries. Its extensible design and robust parsing mechanism make it a valuable tool for chemical information extraction from scientific literature and patents, research and development, and populating chemical databases.