We applied the trained Transformer model to the Morgan fingerprints of 5000 test compounds and evaluated the reconstruction of their SMILES. Out of the reconstructed SMILES strings, 98.4% described valid chemical structures. The accuracy of the reconstruction, measured by the exact match between the original and reconstructed SMILES strings, was 87.5%. For the compounds that were not reconstructed correctly, we calculated compound similarity (Tanimoto coefficient) between the original and reconstructed structures. The average similarity was 0.74, with a standard deviation of 0.18 (maximum value 1, minimum value 0.24) (Fig. ).