Abstract
The air-dried flowers of Tithonia diversifolia , commonly known as native sunflower, afforded tagitinin C ( 1 ), fatty acid esters of faradiol ( 2 ), squalene ( 3 ), and a mixture (1:2) of stigmasterol ( 4 ) and sitosterol ( 5 ). The structure of 1 was elucidated by extensive 1D and 2D NMR spectroscopy, while the structures of 2 to 5 were deduced by a comparison of their 1 H and 13 C NMR spectral data with those found in the literature. Antimicrobial tests on 1 indicated that it was moderately active against S. aureus and C. albicans ; slightly active against E. coli , P. aeruginosa , and T. mentagrophytes ; and inactive against B. subtilis and A. niger .
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