artemisinin malaria 4 secondary metabolites 4 antimicrobial activity 3 antioxidant activity 3 inflammation 3 Celastraceae 2 anticancer 2 antioxidants 2 cancer 2 cannabinoids 2 celastrol 2 cytotoxic activity 2 diabetes 2 flavonoid 2 flavonoids 2 lignans 2 mass spectrometry 2 natural products 2 phenolic derivatives 2 plants 2 terpenoids 2 xanthine oxidase 2 (-)-rabdosiin 1 (E)-piplartine 1 1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid 1 2? 1 4?-dihydroxy-6?-methoxy-3? 1 5?-dimethylchalcone (DMC) 1 ABTS 1