Heteroyclic derivatives are important in organic chemistry as products ‎(‎including natural‎)‎ and/or useful tools in the construction of more complicated molecular entities‎.‎ Their utilization in polymeric‎,‎ medicinal and agricultural chemistry is widely documented‎.‎ Both dyestuff structures and life molecules frequently involve heterocyclic rings that play an important role in several biochemical processes‎.‎ Volume 11 ‎(‎2008‎)‎ keeps the international standard of the THS series and contains fifteen chapters‎,‎ covering the synthesis‎,‎ reactivity‎,‎ activity ‎(‎including medicinal‎)‎ and mass spectrometry of different heterorings‎.‎