FIELD: biotechnology. SUBSTANCE: present invention describes compound of formula 1:
wherein R1 is quinoxaline-2-alkyl, CORa or CORb; R2 is H or alkyl; R3 is C1-C4 alkylidene; R4 is phenylalkyl; R5 is alkoxy, alkylamino, hydroxylamino, A is -(CH2)m-B-(CH2)n. Claimed compounds show inhibitory activity with respect to protease. Compounds I are prepared by reacting at least two peptides and/or amino acids or reactive derivatives thereof followed optionally by removal of protecting group. EFFECT: more efficient preparation method. 15 cl, 1 dwg
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