Update README.md

README.md

@@ -18,5 +18,8 @@ Used this filtering criteria in the ZINC-20 tranches:
 - Annotated purchasability
 - Drug-like subset
 
+Distribution of tokenized SMILES sequence lengths below, along with the top 15 SMILES tokens (with their frequencies). The following regex string was used 
+to split the SMILES molecule into tokens: (\[[^\]]+]|Br?|Cl?|N|O|S|P|F|I|b|c|n|o|s|p|\(|\)|\.|=|#|-|\+|\\|\/|:|~|@|\?|>>?|\*|\$|\%[0-9]{2}|[0-9])
+
 ![Distribution of Sequence Lengths](sequence_lengths_distribution.png)
 ![Top 15 SMILES Tokens and Their Frequencies](top_smiles_tokens.png)