Using O=c1c2ccccc2nc(S)n1-c1ccccc1, ClCc1ccccn1 to produce O=c1c2ccccc2nc(SCc2ccccn2)n1-c1ccccc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.