FIELD: organic chemistry, chemical technology. SUBSTANCE: invention elates to compounds represented by the general formula (I): 
wherein A means NH-group and B means C=O group; or A means C=O group and B means NH-group; R1 means OH-group, L-cladinosyl group of the formula (II): 
or in common with R2 it means ketone; R2 means hydrogen atom or in common with R1 it means ketone; R3 means hydrogen atom or C1-C4-alkanoyl group. Invention relates also to pharmaceutically acceptable addition salts of organic and inorganic acids. Invention claims also method for preparing compounds represented by the general formula (I) and provides preparing novel derivatives of erythromycin A relating to macrolide antibiotics. EFFECT: improved preparing method. 12 cl, 4 tbl, 9 ex
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