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

(Loranthaceae) is a hemiparasitic plant growing on (Fabaceae). The chemical investigation of its leaves and flowers led to the isolation of one new phenolic compound namely (-)-brunneusine (), 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 (; and ) have been tested on four bacterial species of sanitary importance isolated in an aquatic environment.