[Pharmacological activity of the optical isomers of sydnocarb]

Of the two optical isomers of sydnocarb, only 1- (or 1R)-isomer exerts a stimulant effect on the central nervous system. By its stimulant action it differs from both optical isomers of amphetamine. The activity of 1-(IR)-sydnocarb as measured by the locomotor excitation test is similar to that of d(1S)-amphetamine but is significantly less powerful as indicated by stereotypy, hyperthermia, anorexigenic action and antagonism to the depressant effects of reserpine.