Using C1COCCN1, COc1cc2nc(N3CCc4c(CBr)cccc4C3)[nH]c(=O)c2cc1OC to produce COc1cc2nc(N3CCc4c(CN5CCOCC5)cccc4C3)[nH]c(=O)c2cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.