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 as dietary sweeteners
Seltzman, H., & Hsieh, Y. (1987). Aminomalonyl alanine compounds as dietary sweeteners. (U.S. Patent No. 4714619). http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=4714619