Using COC(=O)CCN1CCN(C(=O)OC(C)(C)C)CC1C(=O)OC to produce COC(=O)C1CN2CCN(C(=O)OC(C)(C)C)CC2C1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.