Using S=C=S, CN1C(=O)C(N)N=C(c2cccnc2)c2cc(Cl)ccc21 to produce CN1C(=O)C(N=C=S)N=C(c2cccnc2)c2cc(Cl)ccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.