Acylphloroglucinols from the fruits of Callistemon viminalis

Five new acylphloroglucinols, callistenones L-P (1–5), and three known compounds watsonianone A, callistenones F and H were isolated from the fruits of Callistemon viminalis. Callistenones L and M possessed a bisfuran fused-ring skeleton. Compounds 3–5 were acylphloroglucinol condensed with a β-triketone moiety via a pyrane. Their structures were established from analyses of NMR spectra, CD spectra and X-ray crystallography. Compound 8 showed...