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Agelanthus brunneus  (Loranthaceae) is a hemiparasitic plant growing on  Senna siamea  (Fabaceae). The chemical investigation of its leaves and flowers led to the isolation of one new phenolic compound namely (−)-brunneusine ( 1 ), together with 13 known compounds. The crude leaves and flowers extracts (CLE and CFLE) with their ethyl acetate fractions (EAFL and EAFFL) and some isolated compounds ( 1–3 ;  8–9  and  11–14 ) have been tested on four bacterial species of sanitary importance isolated in an aquatic environment. All the samples except compound  3  showed antibacterial activity with MICs ranging from 0.43 to 8.88.10 3  µg/mL and MBCs from 0.43 to 3.55.10 3  µg/mL. Compounds  9  and  14  showed better activity on all bacterial species tested with MICs ranging from 0.43 to 27.77 µg/mL. Only CLE, EAFL and compounds  14 ,  2 ,  8  and  9  showed bactericidal effects on all bacterial species tested.

zeitschrift für naturforschung c

( − )-Brunneusine, a new phenolic compound with antibacterial properties in aqueous medium from the leaves of  Agelanthus brunneus  (Engl.) Tiegh (LORANTHACEAE)