FIELD : chemistry.SUBSTANCE : invention relates to intermediate compounds of formula (i-3) and (ii-4), in which R is selected from a group consisting of H, C1-8 alkyl, aryl and aryl-C1-4 alkyl, R1 is Cl or CF3, or salt thereof. Invention also relates to a method of producing a compound of formula (I), where R1 is Cl or CF3, R2 is F or Cl and R3 is H or CH3 or to its salt. (i-3)…… (ii-4) (I)EFFECT : technical result is obtaining novel compounds which can be used in producing the final compound of formula (I), which can be used in medicine as C5aR antagonists.35 cl, 4 dwg, 4 ex