Piperidine is a colourless liquid with a fish-like odour. Piperidine is used in rubber vulcanization.  There are various other uses for this chemical. One infamous use is in production of narcotics due to which Piperidine is listed as a precursor by United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances.

Precursor chemicals - from http://www.usdoj.go...
Precursor chemicals - from http://www.usdoj.gov/dea/pubs/history/deahistory_03.htm (Photo credit: Wikipedia)

Solution or Piperidine in water is a strong alkali and is corrosive hence listed under Class 8 in Dangerous Goods Regulations.  IMDG Code lists Piperidine as

UN 2401 Class 8 , Subsidiary Risk 3 packing group I. Piperidine must be separated from acids when transporting or storing.