PROBLEM TO BE SOLVED: To obtain a new crystal of 5-aminolevulinic acid phosphate having high heat stability, a high melting point and excellent hygroscopicity resistance and to provide a method for producing the same.SOLUTION: The 5-aminolevulinic acid phosphate has characteristic peaks at 7.9°±0.2°, 15.8°±0.2°, 18.9°±0.2°, 20.7°±0.2°, 21.1°±0.2°, 21.4°±0.2°, 22.9°±0.2°, 33.1°±0.2° and 34.8°±0.2° as diffraction angle 2&theta by powder X-ray diffraction. The method for producing the 5-aminolevulinic acid phosphate is provided.COPYRIGHT: (C)2008,JPO&INPIT【課題】熱安定性が高く、融点が高く、耐吸湿性に優れた5-アミノレブリン酸リン酸塩の新規な結晶、及びその製造方法を提供すること。【解決手段】粉末X線回折による回折角2θとして、7.9°±0.2°、15.8°±0.2°、18.9°±0.2°、20.7°±0.2°、21.1°±0.2°、21.4°±0.2°、22.9°±0.2°、33.1°±0.2°及び34.8±0.2°に特徴的ピークを示す5-アミノレブリン酸リン酸塩結晶及びその製造方法。【選択図】なし
