Kamal, Ahmed; Faazil, Shaikh; Ramaiah, M. Janaki; Ashraf, Md.; Balakrishna; Pushpavalli; Patel, Nibedita; Pal-Bhadra, Manika Bioorganic and Medicinal Chemistry Letters, 2013, vol. 23, # 20 p. 5733 - 5739 doi: 10.1016/j.bmcl.2013.07.068