Using O=C1OCCC1Br, Nc1ncnc2[nH]cc(-c3ccc(Oc4ccccc4)cc3)c12 to produce Nc1ncnc2c1c(-c1ccc(Oc3ccccc3)cc1)cn2C1CCOC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.