Baruah, Bipul; Dasu, Kavitha; Vaitilingam, Balasubramanian; Vanguri, Akhila; Rao Casturi, Seshagiri; Rao Yeleswarapu, Koteswar Bioorganic and Medicinal Chemistry Letters, 2004 , vol. 14, # 2 p. 445 - 448