Using COC(=O)c1cc(C(C)(C)C)c(O)c(C(C)(C)C)c1, COCCOCCl to produce COCCOCOc1c(C(C)(C)C)cc(C(=O)OC)cc1C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.