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Chemical investigation of the aerial part of Leonurus japonicus led to the isolation and characterization of a new labdane‐type diterpene, named 3α‐acetoxy‐15‐O‐methylleopersin C (3), and a new acylated rutin derivative, named 2′′′‐syringylrutin (9), along with seven known compounds, including a labdane‐type diterpene and six flavonoids. The structures of the new compounds were established by spectroscopic...
A rare labdane diterpene γ‐lactam, 1, and two new labdane diterpenoids, 2 and 3, along with two known diterpenes, 4 and 5, were isolated from the roots of Amomum maximum. Their structures were established on the basis of spectroscopic data. All of the isolates were evaluated for their cytotoxic activities, and compound 3 was found to exhibit an inhibitory activity against MG‐63 cell lines with an...
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