1. Department of Chemistry; Yale University; 225 Prospect Street New Haven CT 06511 USA
2. Department of Pharmacology; Yale School of Medicine; 333 Cedar Street New Haven CT 06520 USA
3. State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; 155 Yang Qiao West Road Fuzhou Fujian 350002 China
4. Department of Bioinformatics; Korea University; 2511 Sejong-ro Sejong 339-700 Korea