6-C-Methylquercetin-3,4'-dimethyl etheris a flavonol derivative isolated from the leaves of Bauhinia thonningii Schum. 6-C-Methylquercetin-3,4'-dimethyl ether has antibacterial activity against Gram-negative multidrug-resistant bacteria and against methicillin-resistant Staphylococcus aureus (MRSA) strains.