| 摘要 |
PCT No. PCT/EP93/00127 Sec. 371 Date Aug. 16, 1993 Sec. 102(e) Date Aug. 16, 1993 PCT Filed Jan. 20, 1993 PCT Pub. No. WO93/15076 PCT Pub. Date Aug. 5, 1993.The treatment of racemic calcium folinate with a sodium salt of ethylendiaminotetraacetic acid and, preferably, calcium cloride determines the separation of a precipitate, whose mother liquors result enriched in a calcium salt of the levofolinic acid, purifiable through repeated crystallizations.
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