Using CC(C)(C)OC(=O)Oc1ccc(C(C)(C)C)c(O)c1, COCCO to produce COCCOc1cc(OC(=O)OC(C)(C)C)ccc1C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.