I thank Dr. Pravesh Kumar, Professor, South California University, U.S.A. for his help. My grateful thanks are to Director, Smithonian Institute, HHMI Biopolymer/W. M. Keck Foundation, Biotechnology Resource Laboratory, Yale University, New Haven, Con; U.S.A. for help in analysis.

My thanks are also to Arbro Pharmaceuticals Ltd., New Delhi India, for carrying out some of the tests.