[1] Univ Dschang, Fac Sci, Dept Chem, POB 67, Dschang, Cameroon
[2] Univ Yaounde I, Fac Sci, Dept Organ Chem, POB 812, Yaounde, Cameroon
[3] Univ Yaounde I, Higher Teacher Training Coll, Dept Chem, POB 47, Yaounde, Cameroon
[4] Univ Tabriz, Fac Agr, Dept Plant Protect, Tabriz 51666, Iran
[5] Univ Bamenda, Fac Sci, Dept Plant Sci, POB 39, Bambili, Cameroon
[6] Helmholtz Ctr Infect Res, Dept Microbial Drugs, Inhoffenstr 7, D-38124 Braunschweig, Germany
[7] German Ctr Infect Res DZIF, Partner Site Hannover Braunschweig, Inhoffenstr 7, D-38124 Braunschweig, Germany