FIELD: organic chemistry, antibiotics. SUBSTANCE: product - crystalline mono-(N, N′- dimethylformamide) -1- carbocephalosporin dihydrate solvate of the formula (I). Product shows definite X-ray diffraction property by interplanar distances and relative intensity measured for powder at irradiation with wavelength λ = 1.5406 
on the copper tube with nickel filter (Cu:Ni) with high stability under condition of relative moisture. Reagent 1: solution of compound of the formula (I) in aqueous N,N′-dimethylformamide. Reagent 2: basic reagent (triethylamine). Reaction conditions: medium pH is brought about 5.75, filtration and drying in the air at temperature 40 C, not above. Synthesized compound is used in medicine. EFFECT: improved method of synthesis.
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