| 摘要 |
A process for the preparation of an alkali metal salt of ampicillin, especially the sodium salt, which comprises adding to an aqueous suspension of ampicillin, at a temperature not exceeding about 4 DEG C, an aqueous solution of an equimolar or somewhat lesser amount of an alkali metal base, filtering the resulting solution until sterile, freezing the filtrate, and lyophilizing the frozen filtrate.
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