1. Department of Chemistry; Karnatak University, Dharwad; Karnataka 580 003 India
2. Maratha Mandals Central Research Laboratory, Belagavi; Karnataka 590 010 India
3. Novel Drug Design and Discovery Laboratory; Department of Pharmaceutical Chemistry; S.E.T.'s College of Pharmacy, Sangolli Rayanna Nagar; Dharwad 580 002, Karnataka India
4. Department of Chemistry; G.S.S. College, Belagavi; Karnataka 590 006 India