A new 24-membered tetralactam with two ethylene dioxy moieties and a mirror symmetry is prepared. Its binding abilities for Na+, Ca2+, Mg2+ and Zn2+ ions was determined by an extraction procedure. A good affinity and a high selectivity are observed for Ca2+. The stability constant of the tetralactam:Ca2+ 1:1 complex is estimated by UV spectrophotometry in THF solution.