Phytochemical analyses of Geigeria alata (Benth. & Hook.) and Froncoeu
ria crispa (Forssk., Gas.) (Asteraceae) essential oils were performed.
G, alata oil showed moderate in vitro cytotoxicity (IC50, mu g/ml aga
inst tumor cells; P388: 2.0, A-549: 2.5 and HT-29: 5.0), and also show
ed weak anti-HIV activity. S-Carvotanacetone, the major component of F
. crispa oil (93.0 %), was isolated and its structure was elucidated b
y 2D-NMR analysis.