C15H24O2,M=236.2, monoclinic, P 21,a=7.229(7),b=14.925 (9),c=6.235 (9) Å, β=92.40 (9)°,V=672.1 Å3,T=−133 °C,Z=2,Dx=1.17 g cm−3. The X-ray diffraction analysis of this sesquiterpenoid fromCarissa opacaconfirmed the previously proposed constitution of the isolate and, furthermore, allowed precise NMR as
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