Using CCOC(=O)CBr, CCCCOc1nc(N)c2nc(Br)n(Cc3ccc(O)cc3)c2n1 to produce CCCCOc1nc(N)c2nc(Br)n(Cc3ccc(OCC(=O)OCC)cc3)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.