Using CC(=O)Oc1c(C(C)(C)C)cc(O)c(C(O)C(C)C)c1C to produce CC(=O)Oc1c(C(C)(C)C)cc2c(c1C)CC(C)(C)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.