| 摘要 |
<p>Crystals of a hydrate of the ß-lactam compound represented by the formula. (1) The crystalline hydrate is produced by regulating an aqueous solution containing a tazobactam salt so as to have an organic-solvent content of 0.1 wt.% or lower, cooling the aqueous solution, and then adding an acid to the aqueous solution to thereby crystallize the hydrate. The crystalline ß-lactam hydrate compound has excellent storage stability.</p> |
