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(+)-Lingzhiol and (−)-lingzhiol, a pair of rotary door-shaped meroterpenoidal enantiomers, were isolated from Ganoderma lucidum. Their structures were identified by spectroscopic methods and X-ray diffraction crystallography. Lingzhiol bears an unusual 5/5/6/6 ring system characteristic of sharing a C-3′–C-7′ axis. Biological evaluation showed that (+)-lingzhiol or (−)-lingzhiol could selectively inhibit the phosphorylation of Smad3 in TGF-β1-induced rat renal proximal tubular cells and activate Nrf2/Keap1 in mesangial cells under diabetic conditions.