13 C -NMR shows that it corresponds to the molecular formula C21H20O10 ( M = 432.1). Comparing the spectrum of compound SXE15 with the spectrum of compound SXE12, we see similarities except for the appearance of the sugar part. Specifically, the 1 H - NMR spectrum ( Table 3.14 ) of compound SXE15 ...
COSY and HMBC. The HMBC spectrum shows interactions between H-2 ( δ H 2.66) with C-3 ( δ C 217.3), H-29 ( δ H 1.23) with C-3 ( δ C 217.3) allowing us to confirm the position of the carbonyl group and two methyl groups, in addition to interactions between H-12 ( δ H 5.12) with C-14 ( δ C ...
LIST OF TABLES Table 1.1. Species composition and distribution of genus Sanchezia 4 Table 1. 2. Published chemical compositions of Sanchezia genus in the world and Vietnam.16 Table 2. 1. Dose levels for testing biological effects of total extract and fractions 40 Benzene leaves Table 3.1. 1H and ...
Figure 1.6. Phenolic compounds isolated from the genus Sanchezia By mass spectrometry and high-performance liquid chromatography, Juliana Mourao Ravasi et al. [107] isolated compounds from different parts of S. oblonga grown in Brazil, including many polyphenolic compounds such as 1- O ...
