Using O=S([O-])S(=O)(=O)[O-], CCCc1nc(C)c2cnc(N)nn12 to produce CCCc1nc(C)c2n1N=C(N)NC2S(=O)(=O)O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.