Abstract
The Cover Feature shows the structures of important extractable and leachable components of elastomeric closures; the type used by the pharmaceutical industry in injection systems such as stoppers and caps. Their structures have been confirmed by de novo synthesis for the first time, starting from isophorone and employing novel organosulfur chemistry. The authors thank Jonathan Stroulger for the design of the cover. More information can be found in the Full Paper by A. Dobbs et al.