Three New Benzophenone Derivatives from Selaginella tamariscina

Area of Science:

• Natural Product Chemistry
• Pharmacology
• Medicinal Chemistry

Background:

• *Selaginella tamariscina* is a plant source of bioactive compounds.
• Benzophenones and flavonoids are classes of natural products with diverse biological activities.
• Investigating novel compounds from medicinal plants is crucial for drug discovery.

Purpose of the Study:

• To isolate and characterize new benzophenone derivatives from *Selaginella tamariscina*.
• To evaluate the cytotoxic effects of isolated compounds against human cancer cell lines.
• To assess the inhibitory potential of compounds on nitric oxide production.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation using 1D, 2D-NMR, and HR-ESI-MS.
• In vitro assays for cytotoxicity (HepG2, SMCC-7721) and nitric oxide inhibition (RAW264.7).

Main Results:

• Three new benzophenones (selagibenzophenones D-F) and three known compounds were isolated.
• Compound 1 is a rare diarylbenzophenone; Compound 2 has a unique biphenyl-bisbenzophenone structure.
• Compound 2 exhibited moderate cytotoxicity and NO inhibitory activity; Compounds 4 and 5 showed moderate cytotoxicity against HepG2 cells.

Conclusions:

• The study identified novel benzophenone structures from *Selaginella tamariscina*.
• Specific compounds demonstrated promising cytotoxic and anti-inflammatory activities.
• Further research into these compounds could lead to new therapeutic agents.