The superoxide release inhibitors, cryptoporic acids C, D, and E; dimeric drimane sesquiterpenoid ethers of isocitric acid from the fungus Cryptoporus volvatus
Abstract
Three novel dimeric drimane sesquiterpenoid ethers of isocitric acid, cryptoporic acids C, D, and E, which are bitter principles and superoxide release inhibitors, have been isolated from the fungus, Cryptoporus volvatus and the structures determined by spectroscopic methods, chemical transformations, and X-ray analysis.