1. Division of Chemistry and Biological ChemistrySchool of Physical and Mathematical SciencesNanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
2. State Key Laboratory of Chemical OncogenomicsKey Laboratory of Chemical GenomicsSchool of Chemical Biology and BiotechnologyPeking University Shenzhen Graduate School 2199 Lishui Road, Room F-312 Nanshan District Shenzhen 518055 China