Using NCc1cccnc1, OC(=S)c1[nH]c2ccc(Cl)cc2c1-c1ccccc1 to produce S=C(NCc1cccnc1)c1[nH]c2ccc(Cl)cc2c1-c1ccccc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.