The invention relates to a novel crystalline cefadroxyl hemihydrate having a K.F. between about 3.5 and 2.0%: such compound is more stable than other cefadroxyl molecules. The novel cefadroxyl is obtained preparing and isolating a novel cefadroxil solvate of dimethylacetamide, or of N-methyl-2-pyrrolidone or of monomethylformamide, slurrying said solvate with a mixture methanol/isopropyl alcohol 30:70 to 50:50 by volume at a temperature of about +45.degree. C. to +55.degree. C. and then filtering the so obtained compound.
本发明涉及一种新型晶体头孢矾半
水合物,其K.F.在约3.5%至2.0%之间:这种化合物比其他头孢矾分子更稳定。该新型头孢矾是通过制备和分离二甲基乙酰胺、N-甲基-
2-吡咯烷酮或单甲基甲酰胺的新型头孢矾溶剂晶体,将该溶剂晶体与
甲醇/
异丙醇30:70至50:50的混合物在约+45℃至+55℃的温度下搅拌,然后过滤所得化合物而获得的。