Using CCCC[Sn](CCCC)(CCCC)c1nnn(COCc2ccccc2)n1, CCOC(=O)c1cccc(Br)c1 to produce CCOC(=O)c1cccc(-c2nnn(COCc3ccccc3)n2)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.