Crystal structure of ochraceolide A isolated from Elaeodendron trichotomum (Turcz.) Lundell.

The title compound, C30 H44 O3 [systematic name: 6a R ,6 b R ,8a S ,9a R ,12a R ,14b R )-4,4,6a,6;b,8a,14b-hexa-methyl-12-methyl-eneicosa-hydro-3 H -phenanthro[1',2':6,7]indeno-[2,1- b ]furan-3,11(2 H )-dione], is a triterpene lactone, which was isolated from di-chloro-methane extract of Elaeodendron trichotomum (Turcz.) Lundell (celastraceae) stem bark. The compound has a lupane skeleton and consists of four fused six-membered rings and two five-membered rings. In the crystal, mol-ecules are linked by weak C-H⋯O hydrogen bonds into a three-dimensional network. The configuration of ochraceolide A was proposed based on analogue compounds which belong to the lupane type.