1. Department of Pharmaceutical Chemistry; Institute of Pharmacy; Nirma University; Ahmedabad 382 481 India
2. Department of Pharmaceutical Chemistry; L.J. Institute of Pharmacy; L.J. Campus, S.G. Highway Ahmedabad 382 210 India
3. Rega Institute for Medical Research; Minderbroedersstraat 10 B-3000 Leuven Belgium