Using CCOC(C)=O, COCN1c2cc(CC(N)=S)ccc2Sc2nccnc21 to produce COCN1c2cc(CC(=N)SC)ccc2Sc2nccnc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.