Using COc1ccc(C(O)C2CCN(C(=O)OC(C)(C)C)CC2)cc1 to produce COc1ccc(C(=O)C2CCN(C(=O)OC(C)(C)C)CC2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.