1 g of defatted flowers or leaves were in vessel already containing 50 ml of aqueous ethanol,then the vessel was placed into microwave decomposition system(Star E Microwave Extraction system,Mile stone,Model-Act 38-Revol-03106)for microwave-assisted extraction.The temperature for extraction was 50 c and time for extraction was 9 min.After this the sample was filtered and volume was made 50 ml in a volumetric flask with aqueous ethanol solvent.