Patent ID: 6849626

Claim:
A semicarbazide of formula I, wherein: R 1 is —(CH 2 ) n —NH 2 , —CON═C(NH 2 ) 2 , —NHC(═NH)—NH 2 or —C(═NH)—NH 2 , which is optionally monosubstituted by —OH, —OCOOA, —OCOO(CH 2 ) n N(A) 2 , —OCOO(CH 2 ) m —Het, —CO—C(A) 2 —R 5 , —COOA, —COSA, —COOAr, —COOAr′, R 2 is H, or COOA, R 3 is unbranched, branched or cyclic alkyl having 1-20 C atoms, in which one or two CH 2 groups are optionally each independently of one another replaced by an O or S atom, or is Ar, Ar′, X or Hal, R 4 is phenyl monosubstituted by S(O) k A, S(O) k NHA, CF 3 , COOA, CH 2 NHA, CN or OA, R 5 is —CHal 3 , —O(C═O)A or Ar is phenyl or naphthyl, which is unsubstituted or mono-, di- or trisubstituted by A, OH, OA, NH 2 , NHA, NA 2 , NO 2 , CF 3 , CN, Hal, NHCOA, COOA, CONH 2 , CONHA, CONA 2 , S(O) n A, S(O) n NH 2 , S(O) n NHA, or S(O) n NA 2 , Ar′ is —(CH 2 ) n —Ar, Het is a mono- or binuclear, saturated, unsaturated or aromatic heterocycle having 1 to 4 N, O and/or S atoms, bonded via N or C, which is optionally unsubstituted or substituted by A, A is H, unbranched, branched or cyclic alkyl having 1-20 C atoms, X is —(CH 2 ) n —Y, Y is COOA, or Hal is F, Cl, Br or I, n is 1, 2, 3, 4, 5 or 6, m is 0 or 1, k is 0, 1 or 2, and i is 0, 1, 2, 3 or 4, or a pharmaceutically acceptable salt or solvate thereof.