Die vorliegende Erfindung betrifft primär die Verwendung bestimmter Verbindungen der Formel (I)oder bestimmter Salze einer Verbindung der Formel (I) oder Mischungen davon zur synergistischen Verstärkung des süßen Geschmacks eines süß schmeckenden Stoffes.In einem Anspruch werden Kombinationen aus Verbindungen der Formel (I) mit weiteren Aromastoffen beschrieben.In method (M1) for synergistically enhancing a sweet taste of a sweet-tasting substance a hydroxyl-flavan compound where the configuration at the chiral carbon atom is (R) or (S), its salt, or a mixture of >= 2 different compounds (I), >= 2 different salts of compounds (I), or >= 1 different compound (I) and >= 1 different salt of compound (I) is used. In method (M1) for synergistically enhancing a sweet taste of a sweet-tasting substance a hydroxyl-flavan compound of formula (I) where the configuration at the chiral carbon atom is (R) or (S), its salt, or a mixture of >= 2 different compounds (I), >= 2 different salts of compounds (I), or >= 1 different compound (I) and >= 1 different salt of compound (I) is used. R 1and R 2H, methyl, or ethyl R 3and R 4H, hydroxyl, methoxy, or ethoxy. Independent claims are included for the following: (1) method (M1a) for flavoring a composition for synergistically enhancing a sweet taste of a sweet-tasting substance (A), for masking or reducing a bitter taste sensation of a bitter-tasting substance (B), and for masking or reducing a bitter taste sensation of a both sweet and bitter-tasting substance (C), involving: using a composition comprising the compound (I), its salt, or a mixture of >= 2 different compounds (I), >= 2 different salts of compounds (I), or >= 1 different compound (I) and >= 1 different salt of compound (I) and >= 1 flavoring or taste-imparting substance selected from vanillin, ethyl vanillin, ethylvanillinisobutyrate, 2,5-dimethyl-4-hydroxy-3(2H)-furanone and its derivatives, homofuronol, maltol and its derivatives, coumarin and its derivatives, gamma-l
