| 摘要 |
2,2-dideutero-5-aminolevulinic acid, or salts, hydrates or solvates thereof (preferably 2,2-dideutero-5-aminolevulinic acid hydrochloride), and a process for producing 2,2-dideutero-5-aminolevulinic acid. This acid is useful as a contrast medium for MRI diagnosis.
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