P-hydroxyphenylpropionic acid is also known as phloryptinic acid. White to light yellow crystals. Insoluble in benzene and chloroform, soluble in ethanol, ether, ethyl acetate and hot water. The ortho is colored when it encounters ferric chloride, and the counterpoint does not show color. It can be used as pharmaceutical raw materials, preparation of gastric medicine and pesticide raw materials.