1. Shanthi, G., Perumal, P.T., Rao, U., and Sehgal, P.K., Indian J. Chem., Sect. B, 2009, vol. 48, p. 1319.
2. Ambler, S.J. Heath, W.F. Singh, J.P., Smith, C.W., and Stramm, L.E., EU Patent no. 619 314; Chem. Abstr., 1995, vol. 122, no. 31 327.
3. Kumar, A., Sharma, S., Maurya, R.A., and Sarkar, J., J. Comb. Chem., 2010, vol. 12, p. 20.
4. Kidwai, M., Saxena, S., Khanb, M.K.R., and Thukral, S.S., Bioorg. Med. Chem. Lett., 2005, vol. 15, p. 4295.
5. Zhou, D., Ren, Z., Cao, W., Chen, J., and Deng, H., J. Heterocycl. Chem., 2008, vol. 45, p. 1865.