I I1 antispasmodic activity is exhibited by those compounds wherein li, R'and R" are three, four or five carbon alkyl groups and total 12-17 carbon atoms. In contrast, trialkylacetamides having 7-11 carbon atoms show only weak antispasmodic a~ tivity.~ However, the latter substances are potent soporifics, a type of action not shown by the higher homologous compounds even in large doses. In view of the accessibility of the trialkylacetamides, it ...