1. Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China, Synapse Technologies, Inc., 6660 NW Marine Drive, Vancouver, BC, Canada, V6T 1Z4, and Peking University−Nonius B.V. Demo Lab For X-ray Diffraction, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China jsma@ipc.ac.cn