Labelled analogue of 1,4,7,10-Tetratosyl-1,4,7,10-tetraazacyclododecane, a macrocylce used as a modifier for the preparation of electrodes used to study the electrochemical behavior of nicotinamide. Coated wire chromium(III) ion-selective electrode can also be prepared based on 1,4,7,10-Tetratosyl-1,4,7,10-tetraazacyclododecane.