[1] Chemical Biology Program, Broad Institute of Harvard, MIT, Cambridge, MA 02142, United States
[2] Department of Chemistry, New York University, New York, NY 10003, United States
[3] Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
[4] NUS MedChem Program of the Office of Life Sciences, National University of Singapore, Singapore 117543, Singapore
[5] Laboratory of Bioimaging Probe Development, Singapore Bioimaging Consortium, Agency for Science, Technology and Research (ASTAR), Singapore 138667, Singapore