Using CSc1ncnc2sc(I)cc12, CCCC[Sn](CCCC)(CCCC)c1c(I)ncn1C to produce CSc1ncnc2sc(-c3c(I)ncn3C)cc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.