Abstract

The 13C-NMR spectra of pieristoxin C, G, H, J and K, and asebotoxin IV of leaves of Pieris japonica D. Don were clarified by single-frequency off-resonance decoupling, selective proton decoupling and partially relaxed Fourier transformation experiment. The spectra were then compared with those of grayanotoxin III, rhodojaponin III and their analogs.

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