Six new phenolic derivatives, including four flavonoids and two benzofuranones, were isolated from the aerial part extracts of Vernonia mapirensis Gleason (synonymous Lepidaploa mapirensis (Gleason) H. Robinson, Vernonia trichoclada Gleason, Asteraceae family), together with four known flavonoids.Their structural elucidation was achieved by extensive spectroscopic methods, 1D-( 1 H, 13 C, 13 C DEPT, TOCSY, ROESY) and 2D-NMR experiments (DQF-COSY, HSQC, HMBC) as well as ESI-MS analysis.
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Morales-Escobar et al. (2007) studied this question.