Abstract: Sweetening agents of the formula: ##STR1## wherein R is an heterocyclic group which, in a preferred embodiment, is a 2-cyanopyrid-5-yl or 2-cyanopyrimidin-5-yl group, A is O, NH or NCN, NH being able to be satisfied in hydrochloride form, n is 1 or 2 and B is COOH or a sodium, potassium, ammonium, calcium or magnesium salt.

Abstract: Sweetening agents, characterized in that they conform to the following formula: ##STR1## wherein: A is an imino (.dbd.N--), iminium (.dbd.N.sup.+ <), methylene (.dbd.C<) group, the iminium group being able to be salified by a physiologically acceptable anion;m and n are number equal to 1 or 2;B:when n=1, represents H, CN, OCH.sub.3, NO.sub.2, SO.sub.2 R, SOR, SO.sub.2 NHR, SO.sub.2 NR.sub.2, wherein R is an alkyl, cycloalkyl or aryl group having up to 10 carbon atoms;when n=2, represents H, CN, OCH.sub.3 ;X:represents CN, NO.sub.2, when B is H, CN, OCH.sub.3 ;represents CN, NO.sub.2, COCH.sub.3, CHO, Cl, CF.sub.3, F, H, when B is NO.sub.2, SO.sub.2 R, SOR, SO.sub.2 NHR, SO.sub.2 NR.sub.2 ;M is a hydrogen atom or a physiologically acceptable organic or inorganic cation.