2-Methoxy-5,7,3',4'-tetrahydroxyflavan 2H-1-Benzopyran-5,7-diol, 2-(3,4-dihydroxyphenyl)-3,4-dihydro-3-methoxy- 3',4',5,7-Tetrahydroxy-3-methoxyflavan 3-Mthf 3-O-methylcatechin 87367-19-9 Meciadanol