Chemical nomenclature converter · OPSIN
IUPAC / systematic name → SMILES
Parse a systematic chemical name into a molecular graph with OPSIN, then validate and canonicalize the result with RDKit. This is a nomenclature parser, not a synonym database: trade names and generic names should be resolved separately.
Chemical name
One name at a time. Stereodescriptors such as (R), (S), (E) and (Z) are retained when OPSIN can interpret them.
Input name
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Formula
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Heavy atoms
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Canonical SMILES
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OPSIN SMILES
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Parser
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2D structure check
Server-rendered from the parsed SMILES with RDKit. Always inspect the graph before treating a converted patent name as chemically confirmed.
Convert a name to draw the resulting structure.
Scope. OPSIN is designed for systematic organic chemical nomenclature. A successful parse means the name was interpretable under its nomenclature rules; it does not prove that an OCR-corrupted patent name was repaired correctly. Likewise, a leading optical-rotation sign such as (+) or (−) does not by itself specify R/S configuration, so this page flags it rather than inventing stereochemistry.