- The cytotoxic activity of a Salacia liana species from Monteverde, Costa Rica, is due to a high concentration of tingenone. Setzer, W.N., Setzer, M.C., Hopper, A.L., Moriarity, D.M., Lehrman, G.K., Niekamp, K.L., Morcomb, S.M., Bates, R.B., McClure, K.J., Stessman, C.C., Haber, W.A. Planta Med. (1998)