Update README.md

README.md

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 # PubChem Isomeric SMILES and Titles Pair Classification
-This dataset contains pairs of isomeric SMILES strings and their corresponding entity titles, with labels indicating whether they refer to the same chemical entity. A label of 1 means the SMILES string and the title correspond to the same entity, while a label of 0 indicates they do not. The dataset is sourced from PubChem (ChEBI source), and it provides valuable information for tasks involving chemical entity matching and description analysis.
+This dataset contains pairs of isomeric SMILES strings and their corresponding entity titles, with labels indicating whether they refer to the same chemical entity. A label of 1 means the SMILES string and the title correspond to the same entity, while a label of 0 indicates they do not. The dataset is sourced from PubChem ([ChEBI](https://www.ebi.ac.uk/chebi/) source), and it provides valuable information for tasks involving chemical entity matching.