Hyperprins A and B, Two Complex Meroterpenoids from Hypericum przewalskii

Area of Science:

• Natural Product Chemistry
• Organic Chemistry
• Pharmacology

Background:

• *Hypericum przewalskii* is a plant source of bioactive compounds.
• Meroterpenoids are complex natural products with diverse biological activities.
• Novel carbon skeletons in natural products are of significant chemical interest.

Purpose of the Study:

• To isolate and characterize new meroterpenoids from *Hypericum przewalskii*.
• To elucidate the unique structures of the isolated compounds.
• To evaluate the biological activities of the novel compounds.

Main Methods:

• Isolation and purification of compounds using chromatographic techniques.
• Structure elucidation via comprehensive spectroscopic data (NMR, MS) and X-ray crystallography.
• Assessment of antiproliferation activity against cancer cell lines and enzyme inhibition assays.

Main Results:

• Isolation of two undescribed meroterpenoids, Hyperprins A (1) and Hyperprins B (2).
• Hyperprins A features a novel hexacyclic system with a tetracyclo[10.3.1.0^3,8.0^8,12]hexadecane motif.
• Hyperprins B possesses a unique tetracyclic scaffold, and its derivative showed protein tyrosine phosphatase 1B (PTP1B) inhibition.
• Compound 1 demonstrated antiproliferation activity against the MV-4-11 cell line.

Conclusions:

• The study successfully identified two novel meroterpenoids with unprecedented structural features.
• Hyperprins A and B represent new chemical entities with potential therapeutic applications.
• The findings contribute to the understanding of meroterpenoid diversity and their biological functions.