Ring A-seco triterpenoids with antibacterial activity from Dysoxylum hainanense

Five new ring A-seco triterpenoids, dysoxyhainic acids F-J (1-5), along with a known ring A-seco triterpenoid koetjapic acid (6) were isolated from the twigs and leaves of Dysoxylum hainanense. Compounds 2-4 and 6 exhibited significant antimicrobial activity against Gram-positive bacteria.