Using CCCCCCCCCCCCCCCCCCO, Cc1cc(C(C)(C)C)c(O)cc1CC(=O)O to produce CCCCCCCCCCCCCCCCCCOC(=O)Cc1cc(O)c(C(C)(C)C)cc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.