This present provides kaempferol-3-(2-E,3-Z-di-p-coumaroyl)-rhamnoside, kaempferol-3-(2-Z-3-E-di-p-coumaroyl)-rhamnoside, and kaempferol-3-(2,3-di-Z-p-coumaroyl)-rhamnoside compounds useful as a new class of anti-bacterial agents. These compounds are extracted from Platanus occidentalis. These compounds were found to exhibit anti-bacterial activity against methicillin resistant Staphylococcus aureus (MRSA).