1. Division of Pharmacognosy; Uppsala University, Biomedical Center; Uppsala SE 75123 Sweden
2. Department of Medicinal Chemistry; Uppsala University, Biomedical Center; Box 574 Uppsala SE 75123 Sweden
3. Pharmacy Discipline; Khulna University; Khulna 9208 Bangladesh
4. W. Szafer Institute of Botany, Polish Academy of Science; Cracow 31-512 Poland