Using C=CCBr, COc1ccc(CNc2nc(NCCCO)nc3nc(NCCCO)[nH]c23)cc1 to produce COc1ccc(CNc2nc(NCCCO)nc3c2nc(NCCCO)n3C(C)C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.