Using O=C(CBr)Nc1nc(-c2ccco2)c(C(=O)C2CCOCC2)s1, COC1CCNCC1 to produce COC1CCN(CC(=O)Nc2nc(-c3ccco3)c(C(=O)C3CCOCC3)s2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.