The subject of the present invention is the preparation of the –2-hydroxy-2-acetic acid of the formula by the resolution of the corresponding racernic compound by using the compounds of the general formula. By heating the molybdate powder from a temperature below 300 C. Furthermore, the rotation angle of each Faraday rotator at the time when the magnetism of each Faraday rotator is saturated is set to 22. The tip of the pin terminal is structured to form a smooth and tapered guiding portion.