Using CSc1nc(N)nc(Br)c1C#N, C=C(OCC)[Sn](CCCC)(CCCC)CCCC to produce C=C(OCC)c1nc(N)nc(SC)c1C#N, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.