1. Bi, Y.; Hamaker, L. K.; Cook, J. M. In Studies in Natural Products Chemistry, Bioactive Natural Products, Part A; Basha, F. Z.; Rahman, A., Eds. The synthesis of macroline related alkaloids. Elsevier Science: Amsterdam, 1993; Vol. 13, p. 383.
2. Hamaker, L. K.; Cook, J. M. In Alkaloids: Chemical and Biological Perspectives; Pelletier, S. W., Ed. The synthesis of macroline related sarpagine alkaloids. Elsevier Science: New York, 1995; Vol. 9, p. 23.
3. Keawpradub, N.; Kirby, G. C.; Steele, J. C. P.; Houghton, P. J. Planta Medica 1999, 65, 690.
4. Wright, C. W.; Allen, D.; Cai, Y.; Phillipson, J. D.; Said, I. M.; Kirby, G. C.; Warhurst, D. C. Phytother. Res. 1992, 6, 121.
5. Banerji, A.; Chakrabarty, M.; Mukherjee, B. Phytochemistry 1972, 11, 2605.