1. Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London N6A 5B7, Ontario, Canada
2. National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
3. High-Field NMR Facility, National Research Council Canada, Ottawa K1A 0R6, Ontario, Canada