Abstract: A novel crystal (B-type crystal) of 7-[2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamide-3-vinyl-3-cephem-4-carboxylic acid (a syn isomer) , characterized in that it exhibits peaks at diffraction angles shown in the following Table 1, in its powder X ray diffraction pattern: TABLE 1 Diffraction Angle 2? (°) approximately 11.7 approximately 16.1 approximately 18.6 approximately 21.2 approximately 22.3 approximately 24.4 approximately 26.2 This crystal is obtained by forming a crystal from a solution at a temperature of ?5 to 5° C. in an acidic state. The crystal is not bulky, exhibits good stability and good filterability, and is excellent in the solubility toward water, and thus can be prepared with case.

Abstract: A novel crystal (B-type crystal) of 7-[2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamide-3-vinyl-3-cephem-4-carboxylic acid (a syn isomer), characterized in that it exhibits peaks at diffraction angles shown in the following Table 1, in its powder X ray diffraction pattern: TABLE 1 Diffraction Angle 2? (°) approximately 11.7 approximately 16.1 approximately 18.6 approximately 21.2 approximately 22.3 approximately 24.4 approximately 26.2 This crystal is obtained by forming a crystal from a solution at a temperature of ?5 to 5° C. in an acidic state. The crystal is not bulky, exhibits good stability and good filterability, and is excellent in the solubility toward water, and thus can be prepared with case.

Abstract: A novel crystal (B-type crystal) of 7-[2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamide-3-vinyl-3-cephem-4-carboxylic acid (a syn isomer), characterized in that it exhibits peaks at diffraction angles shown in the following Table 1, in its powder X ray diffraction pattern: TABLE 1 Diffraction Angle 2? (°) approximately 11.7 approximately 16.1 approximately 18.6 approximately 21.2 approximately 22.3 approximately 24.4 approximately 26.2 This crystal is obtained by forming a crystal from a solution at a temperature of ?5 to 5° C. in an acidic state. The crystal is not bulky, exhibits good stability and good filterability, and is excellent in the solubility toward water, and thus can be prepared with case.