1. Institute Of Pharmacognosy and Phytochemistry, School Of Pharmacy, University Of Lausanne, B.E.P., Ch-1015, Lausanne, Switzerland
2. Swiss Institute Of Experimental Cancer Research, Ch-1066, Epalinges, Switzerland
3. Department Of Chemistry Chancellor College, University Of Malawi, Zomba, Malawi
4. Florpan, Unidad De Investigaciones Farmacognosticas, Facultad De Farmacia, Apartado Postal 1067, Universidad De Panama, Panama, Republic Of Panama
5. DéparteMent De Biologie, Faculté Des Sciences, Université De Niamey, Niamey, Niger