Using COC(=O)CC(=O)OC, CCCC[Sn](/C=C/CBr)(CCCC)CCCC to produce CCCC[Sn](C/C=C/C(C(=O)OC)C(=O)OC)(CCCC)CCCC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.