Using c1ncn(CC2CNCCN2)n1, CC(C)(C)OC(=O)ONC(C#N)c1ccccc1 to produce CC(C)(C)OC(=O)N1CCNC(Cn2cncn2)C1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.