FIGURE 8.

Mass spectrometry and NMR assay of βG in the tea plant. A, shown are mass spectra of the peak corresponding to βG in Fig. 7. B and C, shown are ¹H and ¹³C NMR spectra of the peak corresponding to βG in Fig. 7. ¹H and ¹³C NMR spectra were recorded in methanol-d₄ on a Bruker Avance 400 MHz spectrometer with TMS as an internal standard. Chemical shifts were expressed in ppm (δ). The ¹H and ¹³C NMR spectra were consistent with those of the standard. The compound was identified as βG.