1. Canadian
Light Source, University of Saskatchewan, Saskatoon, Saskatchewan
S7N 0X4, Canada
2. CAS Key
Laboratory of Organic
Solids, Beijing National Laboratory for Molecular Sciences (BNLMS),
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
3. Department of Chemistry, University of Western Ontario, London, Ontario N6A
5B7, Canada