Using CN(CCN)CCNC(=O)OC(C)(C)C, O=C(O)c1cccnc1 to produce CN(CCNC(=O)OC(C)(C)C)CCNC(=O)c1cccnc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.