Natural product chemistry, part 100: The structure of carissone, C15H24O2

C15H24O2,M=236.2, monoclinic, P 21,a=7.229(7),b=14.925 (9),c=6.235 (9) A, β=92.40 (9)°,V=672.1 A3,T=−133 °C,Z=2,Dx=1.17 g cm−3. The X-ray diffraction analysis of this sesquiterpenoid fromCarissa opaca confirmed the previously proposed constitution of the isolate and, furthermore, allowed precise NMR assignment.