Shah, Azhar-Ul-Haq A.; Khan, Zulfiqar A.; Choudhary, Naila; Lohoelter, Christine; Schaefer, Sascha; Marie, Guillaume P.L.; Farooq, Umar; Witulski, Bernhard; Wirth, Thomas Organic Letters, 2009 , vol. 11, # 16 p. 3578 - 3581