An object of the present invention is to provide a crystal of a cyclic phosphonic acid sodium salt (2ccPA) with high purity and excellent storage stability and a method for producing the crystal. The present invention provides a crystal of a cyclic phosphonic acid sodium salt (2ccPA) represented by formula (1):
本发明的目的是提供一种纯度高、贮存稳定性好的环
膦酸钠(2ccPA)晶体及其生产方法。本发明提供了一种由式(1)表示的环
膦酸钠(2ccPA)晶体: