Using Cc1c(C(=O)O)oc2c(C(C)(C)C)cc(C(C)(C)C)c(O)c12 to produce Cc1coc2c(C(C)(C)C)cc(C(C)(C)C)c(O)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.