ACKNOWLEDGMENTS

Please acknowledge the use of the following NMR spectrometer in publications using the statement shown below:

Bruker AV500

"This material is based upon work supported by the National Science Foundation under equipment grant no. CHE-1048804."

Bruker AV600SS

"This work is supported by the MRI program of the National Science Foundation under grant no.1532232"

Bruker NEO600

"This work is supported by the S10 program of the NIH Office of Research Infrastructure Programs, under grant S10OD028644"