1. Department of Chemistry, University of Hawaii at Manoa, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
2. W. M. Keck Laboratory in Astrochemistry, University of Hawaii at Manoa, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
3. Lehrstuhl für Organische Chemie II, Ruhr-Universität Bochum, 44801 Bochum, Germany