1. M. Frerejacque, C.r. hebd. Seances Acad. Sci., 242, 2395 (1956).
2. N.G. Bisset, J.v. Euw, M. Frerejacque, S. Rangaswami, O. Schindler and T. Reichstein, Helv. Chim. Acta, 45, 938 (1962).
3. S. Rangaswami and E. Venkata Rao, Proc. Indian Acad. Sci. Sect. A., 54, 345 (1961).
4. A. Cruz, A. Guzman, J. Iriate, R. Medina and J.M. Muchowski, J. Org. Chem., 44, 3511 (1979).
5. O.P. Gupta, K.C. Misra and R.B. Arora, Indian J. Exp. Biol., 12, 399 (1974).