abstract |
2,2-Dideutero-5-aminolevulinic acid or its salt, or a hydrate or a solvatenthereof, preferably 2,2-dideutero-5-aminolevulinic acid hydrochloride, and a processnfor preparing 2,2-dideutero-5-aminolevulinic acid are provided. The 2,2-Dideutero-5-aminolevulinicnacid provided by the present invention is useful as a contrast mediumnfor MRI diagnosis. |