Free IUPAC name generator for chemical structures — paste SMILES, upload a file, or draw the molecule.
Orthonym turns chemical structures into verified IUPAC systematic names. Paste SMILES (one per line), upload a structure file, or draw the molecule right in the browser — every name is parsed back by OPSIN and checked against your structure, and unnameable molecules get a second, broader pass. The README documents the build process in a dedicated "How Orthonym was built" chapter: "Orthonym was built with Claude Code, under a fixed set of working rules." A rare documented case of an AI agent shipping a deterministic scientific-computing engine — with companion orthonym-skills for agent workflows. From the Steinbeck-Lab team; 8 GitHub stars, updated the day before this listing.