Hypoglycemic N-(2-substituted-3-dialkylamino-2-propenylidene)-N-alkylalkanaminium salts

A compound of the formula ##STR7## wherein R.sup.1 is methyl or ethyl;

• R.sup.2 represents a group of formula R.sup.3 S-- or R.sup.4 O--;
• R.sup.3 is selected from the group consisting of straight or branched chain alkyl having from 1 to 12 carbon atoms, straight or branched chain alkenyl having from 2 to 12 carbon atoms, cycloalkyl having from 3 to 8 carbon atoms, cycloalkylalkyl having from 4 to 10 carbon atoms, benzyl, or phenyl optionally substituted by from 1 to 3 substituents selected from the group consisting of lower alkyl, lower alkoxy, halogen, hydroxy, benzyloxy, di(lower alkyl)amino, nitro, phenyl or benzyl, or by a single 2,3- or 3,4-methylenedioxy moiety;
• R.sup.4 represents cycloalkyl of from 3 to 8 carbon atoms, straight or branched chain alkyl or alkenyl of from 3 to 12 carbon atoms or cycloalkylalkyl of from 4 to 10 carbon atoms;
• An is a pharmaceutically acceptable anion;
• and m is an integer corresponding to the valence of the anion.