Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 723. doi:10.1039/9781849733069-00648. ISBN978-0-85404-182-4. The names acetophenone and benzophenone are retained only for general nomenclature, but no substitution is allowed.