The present invention relates to novel flavors, flavor modifiers, tastants, tast enhancers, umami or sweet tastants, and/or enhances and use thereof. Specific non-natural non-peptide amide compounds and amide derives, such as ethanediamide, urea and acrylamide, are useful flavor or taste modifiers, such as flavoring agents or flavor enhancers and scent or taste enhancers, used in food, drinks and other food or oral medicine or compositions, more concretely scent ("umami" flavor of monosodium glutamate) or sweet taste modifiers, scent or sweet taste flavoring agents, and scent or sweet taste enhancers.