1. Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR, USA
2. Arkansas Statewide Mass Spectrometry Facility, University of Arkansas, 345 N. Campus Drive, Chem 013, 72701, Fayetteville, AR, USA
3. Alexion Pharmaceuticals, 352 Knotter Drive, 06410, Cheshire, CT, USA
4. Department of Microbiology, Kitasato University Medical School, 228-8555, Kanagawa, Japan