Three new natural products, the taraxastane‐type triterpenoid 1, the azafluorene‐based constituent 2‐hydroxyonychine (2), and the diterpenoid nemoralisin (3) were isolated from the EtOH extract of Polyalthia nemoralis, along with five known compounds. The structures of the new compounds were established by in‐depth spectroscopic and mass‐spectrometric analyses, as well as by chemical transformation.
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He et al. (2007) studied this question.
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