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The title compound,4β,6α,9α-trimethy-2-carboxyltricyclo[6.3.0.0(4,5)]undec-2-ene,is a sesquiterpene which was first isolated from Ligularia caloxantha and characterized by MS and NMR.In addition,the structure was determined by X-ray single-crystal diffraction.It crystallizes in orthorhombic,space group P212121 with a = 8.197(2),b = 14.876(3),c = 22.281(6) ,α = β = γ = 90o,V = 2716.9(11) 3,Z = 8,C15H22O2,Mr = 234.34,Dc = 1.146 g/cm3,μ(MoKα) = 0.074 mm-1,F(000) = 1024,the final R = 0.0384 and wR = 0.0856 for 6200 independent reflections(Rint = 0.066) and 2538 observed ones(I > 2σ(I)).In the molecule,there are three fused five-membered rings;while in this crystal form,the asymmetric unit contains two molecules of the same hand and they are linked together by two intermolecular O-H···O hydrogen bonds to form a dimer.
The title compound, 4β, 6α, 9α-trimethy-2-carboxyltricyclo [6.3.0.0 (4,5)] undec-2-ene, is a sesquiterpene which was first isolated from Ligularia caloxantha and characterized by MS and NMR Addition , the structure was determined by X-ray single-crystal diffraction. It crystallizes in orthorhombic space group P212121 with a = 8.197 (2), b = 14.876 (3), c = 22.281 = 90o, V = 2716.9 (11) 3, Z = 8, C15H22O2, Mr = 234.34, Dc = 1.146 g / cm3, μ (MoKα) = 0.074 mm-1, 0.0384 and wR = 0.0856 for 6200 independent reflections (Rint = 0.066) and 2538 observed ones (I> 2σ (I)). In the molecule, there are three fused five-membered rings; while in this crystal form, the asymmetric unit contains two molecules of the same hand and they are linked together by two intermolecular OH ··· O hydrogen bonds to form a dimer.