The Dow Chemical Company
Patent: US5739344 A1, 1998 ;

Li, Zhenyu; Zhan, Peng; Naesens, Lieve; Vanderlinden, Evelien; Liu, Ailin; Du, Guanhua; De Clercq, Erik; Liu, Xinyong
Chemical Biology and Drug Design, 2012 , vol. 79, # 6 p. 1018 - 1024

Seha, Zdenek; Weis, Claus D Helvetica Chimica Acta, 1980 ,  vol. 63,  # 2  p. 413 - 419