CID to SMILES Converter

Convert PubChem CID values to canonical SMILES identifiers.

SMILES output appears here.

File Format Explained

PubChem CID is a numeric compound identifier used by PubChem. It points to a database record rather than directly encoding molecular structure.

SMILES is a compact line notation for molecular connectivity. Converting CID to SMILES is useful when a database gives a PubChem ID but your drawing or cheminformatics tool expects a structure string.

CID lookup depends on PubChem records. Different compound records, salts, isotopes, or stereochemical forms may have different CIDs and SMILES strings.