1. Department
of Chemistry and Medicinal Chemistry Program, National University of Singapore, 3 Science Drive 3, 117543 Singapore
2. Department
of Energy Systems Research, Ajou University, Suwon 443749, Korea
3. Laboratory
of Bioimaging Probe Development, Singapore Bioimaging Consortium, Agency for Science, Technology and Research, 11 Biopolis Way, # 02-02 Helios, 138667 Singapore