Using NC(=O)c1sc(-n2cnc3ccc(O)cc32)nc1-c1cccc(Cl)c1, ClCCBr to produce NC(=O)c1sc(-n2cnc3ccc(OCCCl)cc32)nc1-c1cccc(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.