FIELD: organic chemistry. SUBSTANCE: desired products have common formula given in specification where X is anion of physiologically safety mono- or polybasic inorganic or organic acid, =N-OH group is displaced in syn-position. Said products are prepared by chromatographic separation of mixture of diastereomers having formula given in specification or by solution of mixture of crystalline acid additive salts of diastereomers in dimethylformamide or in dimethylacetamide. The latter process is followed by adding thus obtained solution in 5-50-fold amount of solvent and by crystallization of less polar l-s diastereomer. Said desired products are also prepared by treatment of solution of mixture of diastereomers with formula given in specification and aqueous or organic solution of acid component followed by consequent precipitation of pure diastereomers and their conversion into desired products. EFFECT: improved quality. 7 cl, 1 tbl
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