Using Cn1c(=O)n(CCCOC2CCCCO2)c(=O)c2c(C(O)c3ccc(Cl)cc3)c(Br)cnc21 to produce Cn1c(=O)n(CCCOC=O)c(=O)c2c(Cc3ccc(Cl)cc3)c(Br)cnc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.