Using C=C(OCC)[Sn](CCCC)(CCCC)CCCC, COC(=O)c1cc(OC)c(Br)c(OC)c1 to produce C=C(OCC)c1c(OC)cc(C(=O)OC)cc1OC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.