Typically, the oleoresin of boswellia is reported to be composed of:
  • Sesquiterpenoid essential oils (8 – 12%)
  • Polysaccharides (45 – 60%)
  • Higher terpenoids, including boswellic acids (25 – 35%)
The gum resin of B. serrata to contains:
  • Monoterpenes (α-thujene)
  • Diterpenes (Macrocyclic diterpenoids such as incensole, incensole oxide, inoincencole oxide, a diterpene alcohol (serrtol))
  • Triterpenes (such as α- and β-amyrins)
  • Tetracyclic triterpenic acids (Tirucall-8, 24-dien-21-oic acids)
  • Pentacyclic triterpenic acids (Boswellic acids)
The four major pentacyclic triterpenoids identified in Boswellin® are:
  • β-boswellic acid
  • Acetyl-β-boswellic acid
  • 11-keto-β-boswellic acid
  • Acetyl-11–keto–β-boswellic acid
β-boswellic acid

β-boswellic acid

Acetyl-β-boswellic acid

Acetyl-β-boswellic acid

11-keto-b-boswellic acid (KBA)

11-keto-β-boswellic acid (KBA)

acetyl-11-keto-b-boswellic acid (AKBA)

Acetyl-11-keto-β-boswellic acid (AKBA)

Structures of the pentacyclic triterpenic acids in Boswellia serrata