Using OC1(c2cccc(S)c2)CCOCC1, Ic1ccc2c(c1)C=CC1=NCCN12 to produce OC1(c2cccc(Sc3ccc4c(c3)C=CC3=NCCN34)c2)CCOCC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.