Compounds having relatively long shelf lives in acidic aqueousmedia and which are useful as sweeteners have the formula ##STR1##or are pharmaceutically acceptable salts thereof, wherein X is --ORor --NHR, or --NH.sub.2, with R being alkyl having 3-10 carbonatoms.
Aminomalonyl alanine compounds and use as dietary sweeteners
Seltzman, H., & Hsieh, Y. (1986). IPC No. U.S. Aminomalonyl alanine compounds and use as dietary sweeteners. (U.S. Patent No. 4564528).