FMC Corporation
Patent: US5521190 A1, 1996 ;

Clark, Jerry D.; Davis, Jamie M.; Favor, David; Fay, Lorraine K.; Franklin, Lloyd; Henegar, Kevin E.; Johnson, Douglas S.; Nichelson, Brian J.; Ou, Ligong; Repine, Joseph Thomas; Walters, Michael A.; White, Andrew David; Zhu, Zhijian
Patent: US2005/43309 A1, 2005 ;
Location in patent: Page/Page column 104 ;

Yu, Jianzhong; Zhang, Peizhi; Wu, Jun; Shang, Zhicai
Tetrahedron Letters, 2013 , vol. 54, # 24 p. 3167 - 3170

FMC Corporation
Patent: US4743291 A1, 1988 ;

E. I. Du Pont de Nemours and Company
Patent: US4514211 A1, 1985 ;

E. I. Du Pont de Nemours and Company
Patent: US4589909 A1, 1986 ;