What is "hyperforin"

Hyperforin is a phytochemical produced by some of the members of the plant genus Hypericum, notably Hypericum perforatum (St John's wort). Hyperforin (along with adhyperforin) is believed to be one of the three chief active constituents of St. John's wort -the other two being hypericin (along with pseudohypericin) and several flavonoid constituents.