Using O=Cc1ccccc1, CNC1CCN(C(=O)OC(C)(C)C)CC1 to produce CN(Cc1ccccc1)C1CCN(C(=O)OC(C)(C)C)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.