Using CCN(Cc1nnn(Cc2ccccc2)n1)C1CCN(OC(C)(C)C)CC1 to produce CCN(Cc1nnn(Cc2ccccc2)n1)C1CCNCC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.