1. Department of Chemistry University of California Berkeley CA 94720 USA
2. Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
3. Department of Chemistry and Applied Biosciences ETH Zürich Vladimir Prelog Weg 1–5 8093 Zürich Switzerland
4. Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan Shanxi 030001 China
5. Synfuels China Beijing 100195 China
6. Department of Molecular and Cell Biology Howard Hughes Medical Institute University of California Berkeley CA 94720 USA