Using COc1c2c(cc3occc13)OC(C)(C)CC2=O, O=[O+][O-] to produce COc1c(C=O)c(O)cc2c1C(=O)CC(C)(C)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.