1. Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, 7 Greenhouse Road, Kingston, Rhode Island 02881, United States
2. Structure Elucidation Group, Process and Analytical Research and Development, Merck and Co. Inc, 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
3. Structure Elucidation Group, Process and Analytical Research and Development, Merck and Co. Inc, 126 East Lincoln Avenue, Rahway, New Jersey 07065, United States