Using O=C1CCOCC1, COc1ccc(Cl)c(NC(=O)C(C)(C)C)c1 to produce COc1ccc(Cl)c(NC(=O)C(C)(C)C)c1C1(O)CCOCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.