Compound of the formula (I) where R1 is methyl, R3 denotes unbranched or branched alkyl having 1, 2 or 3 C atoms, where, independently of one another, 1, 2, 3, 4 or 5 H atoms may be replaced by Hal, Het 1 is selected from pyrazolyl, triazolyl and imidazolyl, wherein Het 1 may be unsubstituted or mono- or disubstituted, independently of one another, by alkyl, which may be unsubstituted or mono- or polysubstituted by Hal, -OY, -NYY, Hal and -Het 2 , HET denotes a 5-membered monocyclic aromatic heterocycle, where this heterocycle is linked to the N atom of the skeleton via the ring C atom and where this heterocycle is selected from pyrazolyl, thiazolyl and imidazolyl and may be unsubstituted or substituted by one, two or three substituents, which are selected, independently of one another, from the group consisting of: Hal, A, Het 2 , -(CY 2 ) p -OY, -(CY 2 ) p -OZ, -(CY 2 ) p -O-Het 2 , -(CY 2 ) p -O-(CY 2 ) t -Het 2 , -(CY 2 ) p -O-(CY 2 ) t -NYY, -(CY 2 ) p -O-(CY 2 ) t -OY, -(CY 2 ) p -NYY, -(CY 2 ) p -COOY, -(CY 2 ) p -CO-NYY, -(CY 2 ) p -NY-COY, A in each case independently denotes unbranched or branched alkyl having 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 C atoms, where, independently of one another, 1, 2, 3, 4, 5, 6 or 7 H atoms may be replaced by Hal, Het 2 denotes a monocyclic saturated heterocycle having 2, 3, 4, 5, 6 or 7 C atoms and 1, 2, 3 or 4 N, O and/or S atoms, which may be unsubstituted or monosubstituted by A, Y denotes H or A, Z denotes unbranched or branched alkenyl having 2, 3, 4, 5, 6, 7, 8, 9 or 10 C atoms, where, independently of one another, 1, 2, 3, 4, 5, 6 or 7 H atoms may be replaced by Hal, Hal denotes F, Cl, Br or I, and p denotes 0, 1, 2, 3, 4, 5 or 6 t denotes 1, 2, 3, 4, 5 or 6, and/or pharmaceutically usable salt, solvate, tautomer or stereoisomer thereof. R1 is methyl, R3 denotes unbranched or branched alkyl having 1, 2 or 3 C atoms, where, independently of one another, 1, 2, 3, 4 or 5 H atoms may be replaced by Hal, Het 1 is selected from pyrazolyl, triazolyl and imidazolyl, wherein Het 1 may be unsubstituted or mono- or disubstituted, independently of one another, by alkyl, which may be unsubstituted or mono- or polysubstituted by Hal, -OY, -NYY, Hal and -Het 2 , HET denotes a 5-membered monocyclic aromatic heterocycle, where this heterocycle is linked to the N atom of the skeleton via the ring C atom and where this heterocycle is selected from pyrazolyl, thiazolyl and imidazolyl and may be unsubstituted or substituted by one, two or three substituents, which are selected, independently of one another, from the group consisting of: Hal, A, Het 2 , -(CY 2 ) p -OY, -(CY 2 ) p -OZ, -(CY 2 ) p -O-Het 2 , -(CY 2 ) p -O-(CY 2 ) t -Het 2 , -(CY 2 ) p -O-(CY 2 ) t -NYY, -(CY 2 ) p -O-(CY 2 ) t -OY, -(CY 2 ) p -NYY, -(CY 2 ) p -COOY, -(CY 2 ) p -CO-NYY, -(CY 2 ) p -NY-COY, A in each case independently denotes unbranched or branched alkyl having 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 C atoms, where, independently of one another, 1, 2, 3, 4, 5, 6 or 7 H atoms may be replaced by Hal, Het 2 denotes a monocyclic saturated heterocycle having 2, 3, 4, 5, 6 or 7 C atoms and 1, 2, 3 or 4 N, O and/or S atoms, which may be unsubstituted or monosubstituted by A, Y denotes H or A, Z denotes unbranched or branched alkenyl having 2, 3, 4, 5, 6, 7, 8, 9 or 10 C atoms, where, independently of one another, 1, 2, 3, 4, 5, 6 or 7 H atoms may be replaced by Hal, Hal denotes F, Cl, Br or I, and p denotes 0, 1, 2, 3, 4, 5 or 6 t denotes 1, 2, 3, 4, 5 or 6, <EOS>