1. Division
of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, 500 West 12th Avenue, Columbus, Ohio 43210, United States
2. Nuclear
Magnetic Resonance Facility, Campus Chemical Instrument Center, The Ohio State University, Columbus, Ohio 43210, United States
3. Nature’s Sunshine Products, Inc., 1655 North Main Street, Spanish Fork, Utah 84660, United States