“…During a continuing pursuit of complex and bioactive SDs from Artemisia species, [9][10][11][12][13] artemeriopolides A-D (1-4), four novel sesquiterpenoid dimers belonging to two carbon skeleton types, were isolated and characterized from A. eriopoda, which has been considered as an alternative traditional Chinese herb to A. annua in southern China and used to treat rheumatoid arthritis, edema, and thanatophidia in folk medicine. 16,17 To the best of our knowledge, artemeriopolides A (1) and B (2) feature a novel 5/6/7/5/6/6 hexacyclic scaffold composed of a 5(4→3)-abeo-12-nor-cadinane and a normal cadinane linked by a rare 2-oxaspiro [4.6]undecan-1,7-dione ring system. Artemeriopolides C (3) and D (4) with 6/6/5/6/5(6)/6/6 heptacyclic scaffolds were the first examples of sesquiterpenoid dimers, incorporating two normal cadinane sesquiterpenoid monomers and featuring a rare fused 2-oxaspiro [4.5]decan-1-one in 3 and 2-oxaspiro [5.5]undecan-1one in 4.…”