Hyperwightianols A-H, monoterpenoid demethylated acylphloroglucinol derivatives from Hypericum wightianum.

Twelve undescribed optically pure monoterpenoid demethylated acylphloroglucinol derivatives, named hyperwightianols A-H (1-8), were isolated from the dried whole herb of Hypericum wightianum, along with ten structurally related known compounds (9-18). The structures of the new compounds were elucidated using UV spectroscopy, HRMS, and extensive 1D & 2D NMR experiments. Absolute configurations of the new compounds were determined via chiral HPLC resolution and electronic circular dichroism (ECD) calculations.