Rhapontigenin
Rhapontigenin is a stilbenoid. It can be isolated from Vitis coignetiae or from Gnetum cleistostachyum.
It shows an action on prostate cancer cells. It has been shown to inhibit the human cytochrome [P450 1A1], an enzyme implicated in the biotransformation of a number of carcinogenic and immunotoxic compounds.
Injected in rats, rhapontigenin shows a rapid glucuronidation and a poor bioavailability.