It is amorphous white powder (methanol), also known as plant insulin, 2α-hydroxy ursolic acid, and Barabbas extract or Lagerstroemia speciosa extract. It belongs to α-amyrin type or alkyl-type pentacyclic triterpenoids, and is soluble in petroleum ether, benzene, chloroform, pyridine and some other organic solvents, but insoluble in water; it is also soluble in hot ethanol, methanol. Under anhydrous conditions, when it is reacted with a strong acid (sulfuric acid, phosphoric acid, perchloric acid), the acid (TCA) or Lewis’s acid (zinc chloride, aluminum chloride, antimony trichloride), there will be colorimetric reaction or fluorescence.
Figure 1 the structural formula of corosolic acid
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