Using S=C1N=C(c2ccccc2)C(c2ccccc2)S1, COC(=O)CBr to produce COC(=O)Cc1nc(-c2ccccc2)c(-c2ccccc2)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.