1. E. G. Perez, C. Mendez-Galvez, and B. K. Cassels, Nat. Prod. Rep., 29, 55 (2012).
2. P. M. Lippiello and W. S. Caldwell, US Pat. No. 5,242,916 A (1993), Sept. 7, 1993.
3. B. T. O’Neill, US Pat. No. 6,235,734 B1 (2001), May 22, 2001.
4. J. W. Coe and P. R. P. Brooks, US Pat. No. 6,410,550 B1 (2002), June 25, 2002.
5. M. Picciotto, D. Gundisch, L. Munoz, M. Andra, and Y. Mineur, US Pat. Appl. 2009/0318491 A1 (2009), Dec. 24, 2009.