Using Cc1oc(-c2ccccc2)nc1CCBr, O=C(O)Cc1cccc(S)c1 to produce Cc1oc(-c2ccccc2)nc1CCSc1cccc(CC(=O)O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.