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Information stored after the SMILES string separated by space or tab character are treated as molecule field. (According to the SMILES definition they can be ignored or used as comment.) More molecule fields can be stored after the first one but they should be separated by tab character (to allow space in the data field). The newline and tab characters are escaped during export. By default the first additional information is the molecule name. However, the molecule name is never considered as a field, it is a special property of the molecule. After that more informations can be stored as fields in field_1, field_2, etc. The default behavior can be overridden by import option f, eg: import option "fid,flogP" imports the first field as "id" and the next one as "pKa".