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. Author manuscript; available in PMC: 2017 Mar 25.
Published in final edited form as: J Nat Prod. 2016 Jan 13;79(3):541–554. doi: 10.1021/acs.jnatprod.5b00927

Figure 2.

Figure 2

1H NMR spectrum (900 MHz) of 1 in pyridine-d5. This sample contained 22–28% of an unidentified structurally related impurity, calculated from the signals of H-1′ (29%: 71%) and H-19-endo (22%:78%). Impurity peaks are denoted by *. Original spectra are denoted with an “O” (blue), and the corresponding HiFSA simulations are marked with an “S” (red).