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As SMILES format does not support to save additional information stored in the molecule, Chemaxon ChemAxon adds a header line to the smiles file, if the export of these additional information is requested by T option.
The header files starts with the '#' character followed by the file format string "SMILES" or "SMARTS" and the field names separated by tab characters. The lines followed by the header contains the smiles/smarts string and the field data separated by tab characters.