.gamma.-crystalline form of sodium...

Details .gamma.-crystalline form of sodium... .gamma.-crystalline form of sodium...

C - Chemistry, Metallurgy

07

D

260/105, 260/109

C07D 501/04 (2006.01) A61K 31/545 (2006.01) C07D 501/36 (2006.01)

Patent

CA 1045114

Abstract of the Disclosure A process for preparing a stable, pharmaceutically acceptable, non-solvated anhydrate .gamma.-crystalline form of the cephalosporin antibiotic, sodium 7-(D-.alpha.-formyloxy-.alpha.-phenyl- acetamido)-3-(1-methyl-1H-tetrazol-5-ylthiomethyl)-3-cephem- 4-carboxylate, is described herein. This process involves the conversion of a source of sodium 7-(D-.alpha.-formyloxy-.alpha.- phenylacetamido)-3-(1-methyl-1H-tetrazol-5-ylthiommethyl)- 3-cephem-4-carboxylate with a mixture of a polar organic solvent and miscible antisolvent under anhydrous conditions.

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