A New Biflavonoid from Schinopsis brasiliensis (Anacardiaceae)

Phytochemical investigation of the MeOH extract of Schinopsis brasiliensis Engl. stems led to the isolation of the new biflavanone (2R*, 3R*, 2 " R*, 3 " R*)-7-hydroxy-4'-methoxy-flavanone-(3 -> 3 ")-3"', 7 "-dihydroxy-4"'-methoxy-flavanone and 4,2',4'-trihydroxychalcone-(3 -> O -> 4 ")-2"', 4"'-dihydroxychalcone, whereas methyl gallate, gallic acid, (6R, 9R)-megastigma-4-en-3-one-9-O-beta-glucopyranoside, quercetin-3-O-beta-D-xylopyranoside and tricetin-3'-O-beta-D-glucopyranoside were isolated from the MeOH extract of leaves. Their chemical structures were elucidated using spectroscopic methods and comparison with the literature data. Both biflavonoids showed weak inhibition activities of acetyl and butyrylcholinesterase enzymes when compared with eserine.