1. Haripara K, Patel S, Joshi A and Paresh H, Indian J Heterocyclic Chem., 2004; 13:221.
2. Wagner E, Becam L and Nowakowska E, Bioorg Med Chem., 2004; 12:265-272.
3. Ngaini Z, Siti M Haris-Fadzillah, Hasnain Hussainand Kamarulzamon Kamoruddin, World J Chem., 2009; 4(1): 09-14.
4. Vogel A I, Textbook of Practical Organic Chemistry, 4thEd., Longman, 1981;1371p.
5. Collin C H, Microbiological Methods, Butter Wrths, London, 1964;92.