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具有高纯度和优异储存稳定性的环
磷酸钠盐晶体(2ccPA)以及制备该晶体的方法。本发明提供了一种由
化学式(1)表示的环
磷酸钠盐(2ccPA)的晶体: