The invention provides natural allosteric modulators that are useful as sweet flavor enhancers. The present invention also includes ingestible compositions comprising the present compounds and methods of enhancing the sweet taste of sweeteners and sugars.
New bisabolane sesquiterpenoids from the rhizomes of Curcuma xanthorrhiza (Zingiberaceae) II.
Four bisabolane sesquiterpenoids, named bisacurone epoxide ((1))___∼, bisacurone A ((2))___∼) bisacurone B ((3))___∼ and bisacurone C ((4))___∼, were isolated from the chloroform-soluble fractions of the rhizomes of Curcuma xanthorrhiza (Zingiberaceae). The absolute structures of these new compounds were determined on the basis of their spectral data, chemical conversions and X-rat crystallography. In the process of determining the absolute structure of 1__∼, the stereochemistry reported for bisacurone ((5))___∼ in our previous paper was revised.