| 摘要 |
PCT No. PCT/JP96/01948 Sec. 371 Date Jan. 9, 1998 Sec. 102(e) Date Jan. 9, 1998 PCT Filed Jul. 12, 1996 PCT Pub. No. WO97/03042 PCT Pub. Date Jan. 30, 19972,2-Dideutero-5-aminolevulinic acid or its salt, or a hydrate or a solvate thereof, preferably 2,2-dideutero-5-aminolevulinic acid hydrochloride, and a process for preparing 2,2-dideutero-5-aminolevulinic acid are provided. The 2,2-Dideutero-5-aminolevulinic acid provided by the present invention is useful as a contrast medium for MRI diagnosis.
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