Casticin is a tetramethoxyflavone that consists of quercetagetin in which the hydroxy groups at positions 3, 6, 7 and 4' have been replaced by methoxy groups. It has been isolated from Eremophila mitchellii. It has a role as an apoptosis inducer and a plant metabolite. It is a tetramethoxyflavone and a dihydroxyflavone. It derives from a quercetagetin.