Using Oc1cccc(CCc2nc(-c3ccsc3)c(-c3ccsc3)o2)c1, COC(=O)CBr to produce COC(=O)COc1cccc(CCc2nc(-c3ccsc3)c(-c3ccsc3)o2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.