Using COc1cc(C)c(C(=O)c2c(OC(C)=O)ccc(Br)c2C)c(OC)c1OC to produce COc1cc(C)c(C(=O)c2c(O)ccc(Br)c2C)c(OC)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.