1H NMR and 13C NMR spectra were recorded on a Bruker AVANCE AV400 (400 and 100 MHz). Signal positions were reported in part per million (ppm) relative to the residual solvent peaks or to the peak of Si(CH3)4 used as an internal standard with the abbreviations s, d, t, q, and m, denoting singlet, doublet, triplet, quartlet and multiplet, respectively. The residual 1H peak of deuterated solvent appeared at 4.79 ppm in D2O, at 7.26 ppm in CDCl3. All coupling constants J are quoted in Hz.