Polycyclic Polyprenylated Acylphloroglucinols from Hypericum himalaicum

Six previously undescribed polycyclic polyprenylated acylphloroglucinols (PPAPs) with a vicinal diol moiety (1: -6: ) were isolated from the whole plant of Hypericum himalaicum. Their structures were established through a comprehensive analysis of HRMS and 1D and 2D NMR data, while the absolute configurations were determined using the Mo₂(OAc)₄-induced circular dichroism (ICD), ECD, and NMR calculations. Compound 1: attenuated the secretion of NO, TNF-α, and IL-6, downregulated the protein expression of COX-2 and iNOS, and inhibited the release of ROS in LPS-induced RAW264.7 macrophages. Further investigation revealed that the anti-inflammatory effects may be attributed to the inhibition of the NF-κB and NLRP3 signaling pathways.