4H-1-Benzopyran-4-one, 2-(3,4-dihydroxy-5-methoxyphenyl)-2,3-dihydro-3,5,7-trihydroxy-, (2R-trans)- 5,7,4',5'-Tetrahydroxy-3'-methoxydihydroflavonol 71106-82-6 Hovenitin I Hovenitin II