1. Department of Pharmacognosy, Faculty of Pharmacy, Obafemi Awolowo University, Ile-Ife, Nigeria
2. Department of Pharmacognosy, Faculty of Pharmacy, Olabisi Onabanjo University, Sagamu campus, Nigeria
3. Istituto del C.N.R. di Chimica Biomolecolare, Via del Santuario, 110 I-95028 Valverde CT, Italy