- Preparative separation of naphthyltetrahydroisoquinoline alkaloids from Ancistrocladus korupensis by centrifugal partition chromatography. Hallock, Y.F., Dai, J., Bokesch, H.R., Dillah, K.B., Manfredi, K.P., Cardellina, J.H., Boyd, M.R. Journal of chromatography. A. (1994)