One new lycopodine-type Lycopodium alkaloid, dehydroisofawcettiine N-oxide (1) and eleven known analogues (2–12) were isolated from the whole plant of Diphasiastrum complanatum. The new structure was established on the basis of spectroscopic methods, including 2D NMR techniques. The absolute configurations of 2 and its new N-oxide derivative (1) were deduced by chemical transformation combined with Cotton effects in their electronic circular dichroism (ECD) spectra.
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