Using COCCN1C(=O)CNc2ncc(Br)nc21, CC(C)(O)c1ccc([Sn](C)(C)C)cn1 to produce COCCN1C(=O)CNc2ncc(-c3ccc(C(C)(C)O)nc3)nc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.