參考文獻:
Chai, Wenying Breitenbucher, J. Guy Kwok, Annette Li, Xiaobing Wong, Victoria Carruthers, Nicholas I. Lovenberg, Timothy W. Mazur, Curt Wilson, Sandy J. Axe, Frank U. Jones, Todd K. Bioorganic and Medicinal Chemistry Letters, 2003 , vol. 13, # 10 p. 1767 - 1770