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. Author manuscript; available in PMC: 2018 Aug 1.
Published in final edited form as: European J Org Chem. 2018 Mar 24;2018(20-21):2651–2656. doi: 10.1002/ejoc.201800199

Figure 4.

Figure 4

Mass spectra of (A) natural compound A, and (B) hydrogenated natural compound A. The shift of the M+-ion by 4 amu indicates the presence of two C–C double bonds in A.