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   HUA YE et al, 2016 CrossRef
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5. Diversity of Adenostemma lavenia, multi-potential herbs, and its kaurenoic acid composition between Japan and Taiwan
   Miwa Maeda et al, 2021, J Nat Med CrossRef
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   Vartika Jain et al, 2023 CrossRef
7. Crystal structure of 7α,11α-dihydroxy-15-oxo-ent-kauran-16-en-19,6β-olide, C20H26O5
   Lu Zhang et al, 2023 CrossRef