Using CCOC(C)=O, COc1c(C=O)cc(C(C)(C)C)cc1C(C)(C)C to produce CCOC(=O)CC(O)c1cc(C(C)(C)C)cc(C(C)(C)C)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.