Flavonoids and triterpenoids isolated from the ethyl acetate extract of Maytenus quadrangulata leaves.

The new flavonoid 4'-O-methylepigallocatechin 5-O-β-D-glucopyranoside (1), along with four known triterpenes (2-4), a steroid (6), and a flavonoid (7) were isolated from the ethyl acetate extract of Maytenus quadrangulata leaves. The chemical structures of the isolated compounds were determined through analysis of 1D NMR (1H and 13C) spectroscopic data, in addition to 2D NMR and spectrometric (MS) data for compound 1. This is the first report of the isolation of compounds 3-O-β-D-glucosyl-β-sitosterol (6) and 4'-O-methylepigallocatechin (7) from this species. Compounds 1 and 7 were evaluated against the bacteria Staphylococcus aureus and Klebsiella pneumoniae, but neither exhibited activity even at the highest concentration tested.