參考文獻:
Singh, Ishwar Prasad, Ashok K. Sharma, Ajendra K. Saxena, Rajendra K. Olsen, Carl E. Cholli, Ashok L. Samuelson, Lynne A. Kumar, Jayant Watterson, Arthur C. Parmar, Virinder S. Bioorganic and Medicinal Chemistry, 2003 , vol. 11, # 4 p. 529 - 538