Using COS(=O)(=O)OC, COCc1cccc(OCCc2cnc(S)[nH]c2=O)c1 to produce COCc1cccc(OCCc2cnc(SC)[nH]c2=O)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.