Agrimol B is isolated and purified from the herbs of Agrimonia pilosa Ledeb.Agrimol B has antibacterial activity against Pseudomonas syringae pv. lacrymans (bacterial leaf spot pathogen), Ralstonia solanacearum (tomato bacterial wilt pathogen) and Pseudomonas syringae pv. tabaci (Tobacco wild fire pathogen). Agrimol B has a therapeutic potential on alleviating obesity, through modulation of SIRT1-PPARγ signal pathway.