Isolation and identification of antiplasmodial N-alkylamides from Spilanthes acmella flowers using centrifugal partition chromatography and ESI-IT-TOF-MS - Mbeunkui, F; Grace, M H; Lategan, C; Smith, P J; Raskin, I; Lila, M A (J Chromatogr B Analyt Technol Biomed Life Sci, 2011)