3-Acetoxy Group of Genuine AKBA (Acetyl-11-keto-β-boswellic Acid) is α-Configurated

Abstract

The pentacyclic triterpenoid 3-acetyl-11-keto-β-boswellic acid (AKBA) from the resin of Boswellia spec. is a potent inhibitor of 5-lipoxygenase (5-LO). We noticed discrepancies in the nomenclature and stereochemistry of the 3-acetoxy group of boswellic acids. Isolation of AKBA under mild conditions and the data from the first X-ray crystallography study evidence the 3α-orientation of AKBA's acetoxy function.

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