Using C[O-], CCOC(=O)c1nc(CBr)n(Cc2ccccc2)c1C(=O)OCC to produce COCc1nc(C(=O)OC)c(C(=O)OC)n1Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.