Hossain, M. M.; Ferdous, N. N.; Muhib, M. H.; Alam, M. S.; Islam, M. R.; Hai, M. A.; Zoghaib, W. The Effect of Deactivating Groups in the Formation of Some Biologically Important Lactams (Isatins) and Their Further Derivatization. J. Bangla. Chem. Soc. 2012, 25, 46-52.