Using O=C(OO)c1cccc(Cl)c1, COc1ccc2ncc(Cc3ccc4nc(SC)sc4c3)n2n1 to produce COc1ccc2ncc(Cc3ccc4nc(S(C)=O)sc4c3)n2n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.