Using CC(=O)c1cn(CC(=O)OC(C)(C)C)c2ccc(O)cc12, O=C([O-])[O-] to produce COc1ccc2c(c1)c(C(C)=O)cn2CC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.