Hi @Lyq322,
Couple of things to consider before merging.

'cis-11-octadecenal': 'CCCCCC\C=C/CCCCCCCCCC=O'
In this case as an example, if the string contains \C or C/(any other combination) , Python would look for an escape sequence, which could lead to a syntax error or unintended behavior.

With Raw String (Correct Handling):
'cis-11-octadecenal': r'CCCCCC\C=C/CCCCCCCCCC=O'
Here, the r prefix ensures that all characters in the string are taken literally, preserving the intended SMILES notation, including the backslashes. This is crucial for accurately representing the molecular structure and ensuring that cheminformatics software can correctly parse the SMILES string.

Need to add smarts def in to the code

    @staticmethod
    def get_smarts():

         smarts = {
         }

         return smarts