| abstract |
A novel crystal (B-type crystal) of 7-[2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamide-3-vinyl-3-cephem-4-carboxylicnacid (a syn isomer), characterized in that it exhibits peaksnat diffraction angles shown in the following Table 1, in itsnpowder X ray diffraction pattern:n nThis crystal is obtained by forming a crystal from a solutionnat a temperature of -5 to 5°C in an acidic state. The crystalnis not bulky, exhibits good stability and good filterability,nand is excellent in the solubility toward water, and thus cannbe prepared with case. |