1. Department of Chemistry, Trinity University, One Trinity Place, San Antonio, Texas 78212, United States
2. Department of Paleobiology, National Museum of Natural History, Washington, D.C. 20560, United States
3. Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60025, United States
4. Detroit Institute of Arts, 5200 Woodward Avenue, Detroit, Michigan 48202, United States