FIELD: organic chemistry, chemistry of proteins, polypeptides. SUBSTANCE: invention describes novel polypeptide compounds of the general formula (I) 
where R1 means hydrogen atom; R2 means acyl-group; R3 means hydroxy- -group; R4 means hydroxy- or hydroxysulfonyloxy-group; R5 means hydrogen atom or lower alkyl that can has one or two substituents taken among -OH, -COOH; R6 means hydrogen atom, hydroxy- or acyl-(lower)-alkylthio-group and their pharmaceutically acceptable salts. Compounds show antibacterial activity and can be used for prophylaxis and treatment of humans and animals against infection with virus Pneumocystis carinii. EFFECT: enhanced effectiveness of compounds, valuable medicinal properties. 12 cl
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