Using NC(=O)c1cccc2c(NCc3cccc(NC(=O)c4cccc(O)c4)c3)ncnc12, COCCBr to produce COCCOc1cccc(C(=O)Nc2cccc(CNc3ncnc4c(C(N)=O)cccc34)c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.