Structural analysis of a novel antimutagenic compound, 4-hydroxypanduratin A, and antimutagenic activity of flavonoids in a Thai spice, fingerroot (Boesenbergia pandurata Schult.) against mutagenic heterocyclic amines - Trakoontivakorn,G.; Nakahara,K.; Shinmoto,H.; Takenaka,M.; Onishi-kameyama,M.; Ono,H. (J Agric Food Chem, 2001)