1. a Department of Pharmacognosy, College of Pharmacy , University of Rhode Island , Kingston, Rhode Island, 02881
2. d Department of Medicinal Chemistry and Pharmacognosy College of Pharmacy , University of Houston , Houston, Texas, 77004
3. b Department of Biochemistry , University of New Hampshire , Durham, New Hampshire, 03824
4. c Department of Zoology , University of New Hampshire , Durham, New Hampshire, 03824