α-acetyl Boswellic acid is a pentacyclic triterpene and isomer of β-acetyl-boswellic acid originally isolated from B. serrata. It inhibits LPS-induced TNF-α mRNA expression in monocytes as well as NF-κB activity in HEK293 cells when used at a concentration of 10 μM. α-acetyl Boswellic acid also inhibits phosphorylation of IκBα mediated by IκB kinases (IKKs) in monocytes.