Figure 2.
(a) COSY correlations of the purified active compound. (b) The partial fragment structure deduced based on 1H NMR, HSQC and COSY spectra. (c) The identified structure of the active compound.
(a) COSY correlations of the purified active compound. (b) The partial fragment structure deduced based on 1H NMR, HSQC and COSY spectra. (c) The identified structure of the active compound.