Using COCCNc1ccc(C#N)c(Oc2ccc(Br)c(C3OCCO3)c2)n1 to produce COCCNc1ccc(C#N)c(Oc2ccc(Br)c(C=O)c2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.