Using CN1CCN(C(=O)CN(C(=O)OC(C)(C)C)[C@@H]2C[C@H]2c2ccc(-c3ccccc3)cc2)CC1 to produce CN1CCN(C(=O)CN[C@@H]2C[C@H]2c2ccc(-c3ccccc3)cc2)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.