Sweetening agent derived from L-aspartic or L-glutamic acid

A sweetening agent of the formula ##STR35## wherein R is an acyl group of the formula ##STR36## in which R.sub.1 is a methyl, ethyl, propyl, isopropyl, phenyl, methoxy, ethoxy, trihalogenomethyl, chloro or chloro-methyl radical;

• R.sub.2 is a hydrogen atom or a methyl, ethyl or methoxy radical;
• or R.sub.1 and R.sub.2, taken together with the carbon atom to which they are bonded, form a cycloalkyl group having from 3 to 6 carbon atoms;
• and R.sub.3 is an alkyl radical having from 3 to 11 carbon atoms, an alkenyl radical having from 3 to 7 carbon atoms, a cycloalkyl radical having from 3 to 7 carbon atoms, a cycloalkylalkyl radical of which the cycloalkyl part has from 3 to 6 carbon atoms and the alkyl part has from 1 to 3 carbon atoms, a phenyl radical, a phenylalkyl radical of which the alkyl part has from 1 to 3 carbon atoms, an alkoxy radical having from 3 to 10 carbon atoms, a cycloalkoxy radical having from 3 to 6 carbon atoms, in which the two positions adjacent to carbon 1 attached to the oxygen can each be substituted by 1 or 2 methyl groups, a cycloalkylalkoxy radical of which the cycloalkyl part has from 3 to 6 carbon atoms and the alkoxy part has from 1 to 3 carbon atoms, a phenoxy radical or a phenylalkoxy radical of which the alkoxy part has from 1 to 3 carbon atoms;
• n is equal to 1 or 2;
• and
• R' is a group of the formula ##STR37## in which Y and Z, which are identical, are N, and in which X is CN, NO.sub.2, Cl, CF.sub.3, COOCH.sub.3, COCH.sub.3, COCF.sub.3, CONH.sub.2, CON(CH.sub.3).sub.2, SO.sub.2 CH.sub.3, N.sub.3 or H;
• or a physiologically acceptable salt thereof.