ACS Cent Sci 2015 Jul 13;1(4):181-190. Epub 2015 Jul 13.
Department of Biochemistry, National Magnetic Resonance Facility at Madison, and Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States ; Department of Biochemistry, National Magnetic Resonance Facility at Madison, and Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.