New detections of HC$_{5}$N toward hot cores associated with 6.7 GHz   methanol masers
  We present new detections of cyanodiacetylene (HC$_{5}$N) toward hot molecular cores, observed with the Tidbinbilla 34 m radio telescope (DSS-34). In a sample of 79 hot molecular cores, HC$_{5}$N was detected towards 35. These results are counter to the expectation that long chain cyanopolyynes, such as HC$_{5}$N, are not typically found in hot molecular cores, unlike their shorter chain counterpart HC$_{3}$N. However it is consistent with recent models which suggest HC$_{5}$N may exist for a limited period during the evolution of hot molecular cores. 
Claire-Elise Green, James A. Green, Michael G. Burton, Shinji   Horiuchi, Nicholas F. H. Tothill, Andrew J. Walsh, Cormac R....
astro-ph.GA