Using Cc1cc(Cl)cc2c(O)c(C(=O)NCC(=O)O)c(=O)sc12 to produce Cc1cccc2c(O)c(C(=O)NCC(=O)O)c(=O)sc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.