Using CCOC(=O)CBr, COc1cc(C(=O)Nc2nc3c(OC)ccc(N4CCOCC4)c3s2)ccn1 to produce CCOC(=O)Cn1ccc(C(=O)Nc2nc3c(OC)ccc(N4CCOCC4)c3s2)cc1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.