Using CCCC[Sn](CCCC)(CCCC)COCOC, Cn1cnc2c(F)c(Nc3ccc(Br)cc3Cl)c(C=O)cc21 to produce COCOCC(O)c1cc2c(ncn2C)c(F)c1Nc1ccc(Br)cc1Cl, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.