Antimicrobial Furoquinoline Alkaloids from Vepris Lecomteana (Pierre) Cheek & T. Heller (Rutaceae)

Three new prenylated furoquinoline alkaloids named lecomtequinoline A (), B (), and C (), together with the known compounds anhydroevoxine (), evoxine (), dictamnine (), methylflindersine (), evoxanthine (), hesperidin, lupeol, -sitosterol, stigmasterol, -sitosterol-3---d-glucopyranoside, stearic acid, and myristyl alcohol, were isolated by bioassay-guided fractionation of the methanolic extracts of leaves and stem of . The structures of compounds were determined by spectroscopic methods (NMR, MS, UV, and IR) and by comparison with previously reported data. Crude extracts of leaves and stem displayed high antimicrobial activity, with Minimum Inhibitory Concentration (MIC) (values of 10.1-16.5 and 10.2-20.5 µg/mL, respectively, against , , , , and , while compounds - showed values ranging from 11.1 to 18.7 µg/mL or were inactive, suggesting synergistic effect. The extracts may find application in crude drug preparations in Western Africa where is endemic, subject to negative toxicity results in vivo