Orthosphenic acid (compound 12) is a natural product isolated from the roots of Tripterygium wilfordii[1].
ChEBI: Orthosphenic acid is a tricyclic diterpenoid having formula C30H48O5, originally isolated from the bark of Tripterygium wilfordii. It is a hexacyclic triterpenoid, a diol, a hydroxy monocarboxylic acid and a cyclic hemiketal. It derives from a hydride of a friedelane.
[1] Hu P Y, et al. Chemical constituents from the root of Tripterygium wilfordii[J]. Asian Journal of Chemistry, 2014, 26(14): 4344-4346.