FIELD: organic chemistry. SUBSTANCE: invention proposes derivatives of cyclopentane- or cyclopentene--β--amino acids of the formula (I) 
where A, B, D, E, G, L, M and T mean H, halogen, OH-group possibly substituted with C1-C8-alkyl, or B and D, E and G or L and M mean residue of the formula =CR6R7 or =N-OH, or E and G or B and D mean together = O; R1 is H, C1-C8--alkyl; R2 is H, amino-protecting group, C1-C8-alkyl, C1-C8-acyl, benzoyl or an amino acid residue -CO-CH; R9 is NH-R10; R3 is H possibly substituted with C1-C8-alkyl, or their salts. Compounds of the formula (I) are biologically active substances and can be used in composition exhibiting activity with respect to the strains Streptococcus aureus, Candida and Trichophyton. EFFECT: compounds indicated above, improved method of synthesis. 5 cl, 5 tbl
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