Although extensive research has been carried out on reducing the number of invalid outputs, no previous study has investigated the potential of these incorrect outputs. These outputs could be a useful source for the generation of new molecules. In addition to this, it is probable that errors occur more frequently in more complex or longer sequences . Therefore, the objective of this study is to fix these incorrect sequences and analyze the resulting molecules. Additionally, SMILES correction could offer a new approach to de novo drug design, in which the chemical space around existing molecules is expanded by introducing and fixing errors.