| 摘要 |
<p>Disclosed are: a novel crystal of 5-aminolevulinic acid phosphate having high thermal stability, a high melting point and excellent water absorption resistance; and a process for producing the crystal. Specifically disclosed are: a crystal of 5-aminolevulinic acid phosphate, which has characteristic peaks at diffraction angle (2?) = 7.9º ± 0.2º, 15.8º ± 0.2º, 18.9º ± 0.2º, 20.7º ± 0.2º, 21.2º ± 0.2º, 21.4º ± 0.2º, 22.9º ± 0.2º, 33.1º ± 0.2º and 34.8º ± 0.2º in a powder X-ray diffraction; and a process for producing the crystal.</p> |
