Abstract
Triterpenoids in the bark of Pieris japonica D. DON were investigated. Oleanolic acid acetate, ursolic acid acetate, ursolic acid, β-sitosterol, lupeol and compound A (VI), mp 262-263°, C32H50O5, were obtained. The physical properties of VI were elucidated by infrared absorption, nuclear magnetic resonance (NMR), 13C-NMR and mass spectral studies. The structure of VI is probably 3β-acetoxy-16α-hydroxy-ursan-28, 19-olide.
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