Meta-chloroperoxybenzoic acid (m-CPBA) is a carboxylic acid derivative, which is a white powdery crystal, almost insoluble in water, easily soluble in ethanol and ether, soluble in chloroform and dichloroethane. It is thermally stable, and the annual decomposition rate is less than 1% at room temperature. The decomposition rate is accelerated in the liquid state.