Using C1COCCN1, O=C1Nc2cc(Br)ccc2N2CCc3cccc1c32 to produce Brc1ccc2c(c1)N=C(N1CCOCC1)c1cccc3c1N2CC3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.