Spathulenol is isolated from Aristolochia yunnanensis, and has antioxidant, anti-inflammatory, antiproliferative and antimycobacterial activities. Spathulenol shows a high antioxidant activity with an IC50 of 85.60 μg/mL in the DPPH system[1].In Vitro: Spathulenol exhibits a high antioxidant activity s in the DPPH and MDA system, exhibits significant DPPH free radical activity, with IC50 values of 85.60 μg/mL[1].In Vivo: Spathulenol (oral administration; 300 mg/kg) shows a significant inhibition in the Cg-induced mice paw oedema and pleurisy model.In a spontaneous lipoperoxidation rat brain homogenate model, when incubated in controlled temperature andoxygenation conditions, PG-1 exhibits a high activity with an IC50 value of 26.13 μg/mL, respectively, which iscomparable to a commercial antioxidant BHT (38.41 μg/mL), Thus, PG-1 contributes to a decrease in the generation of MDA,which is a toxic product resulting from the degradation of the cell membrane by lipid peroxidation, causing cell ruptures and mutations[1].