1. Collaborative Mass Spectrometry Innovation Center, University of California, San Diego, La Jolla, California 92093, United States
2. Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92093, United States
3. Institut de Chimie des Substances Naturelles, CNRS, ICSN UPR 2301, Université Paris-Sud, 91198, Gif-sur-Yvette, France
4. Laboratoire de Chimie des Produits Naturels, CNRS, UMR SPE 6134, University of Corsica, 20250, Corte, France
5. European Molecular Biology Laboratory, EMBL, Heidelberg, Germany
6. Laboratory for Virology and Experimental Chemotherapy, Rega Institute for Medical Research, KU Leuven, 3000 Leuven, Belgium