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LC/MS fractionation of X. aethiopica extract and structure of EOKA, the active compound in peak 1. (A) High-performance liquid chromatography (C18 HPLC column) profile of 70% ethanol extract (ES-TIC: mass 100 to 600, and UV: diode array 210-400 nm). Selected areas 1 and 2, and peaks 1 and 2 are indicated. (B) Chemical structure of ent-15-oxokaur-16-en-19-oic acid (EOKA).
