1. Ayres, D.D., Lignans: Chemical, Biological, and Clinical Properties, Ayres, D.D. and Loike, J.D., Eds., Cambridge, UK: Cambridge University Press, 1990, p. 402.
2. Begum, S.A, Sahai, M., and Ray, A.B., Fortschritte der Chemie organischer Naturstoffe/Progress in the Chemistry of Organic Natural Products, Kinghorn, A.D., Falk, H., and Kobayashi, J., Eds., Wien: Springer, 2010, vol. 93, p. 1.
3. Moss, G.P., Pure Appl. Chem., 2000, vol. 72, p. 1493.
4. Ward, R.S., Studies in Natural Products Chemistry, Attaur-Rahman, Ed., Amsterdam: Elsevier, 2000, vol. 24, part E, p. 739.
5. Sellars, J.D. and Steel, P.G., Eur. J. Org. Chem., 2007, p. 3815.