1. Department of Chemistry, Stanford University, Stanford, California 94305 (USA)
2. Chemical and Materials Science Center, National Renewable Energy Laboratory, Golden, Colorado 80401 (USA)
3. Division of Hematology, School of Medicine, Stanford University, Stanford, California 94305 (USA)
4. Department of Radiology and Bio‐X Program, School of Medicine, Stanford University, Stanford, California 94305 (USA)