Using O=S(Cl)Cl, OC(Cn1cncn1)c1ccc(-c2ccc(Cl)cc2)cc1 to produce Clc1ccc(-c2ccc(C(Cl)Cn3cncn3)cc2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.