Neurokinin antagonists

A compound of formula (I):

• or a pharmaceutically acceptable salt thereof,
• wherein
• R1 denotes C1-C6-alkyl or Ar2,
• R2 denotes hydrogen, C1-C6-alkyl or C3-C6-cycloalkylmethyl, or
• R1 and R2 taken together denote a C2-C3-alkylenediyl group optionally substituted by one or two oxo groups,
• X denotes O or NR5,
• Ar1 and Ar2 independently of one another denote unsubstituted phenyl or phenyl which is 1- to 5-substituted by halogen, hydroxy, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-fluoroalkyl, C1-C4-fluoroalkoxy or —OCH2O—;
• R3 denotes 2-phenyl-ethyl, wherein the phenyl group may be substituted by 1 to 3 substituents, wherein the substituents, independently of one another, are selected from halogen, hydroxy, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-fluoroalkyl, and C1-C4-fluoroalkoxy;
• denotes hydrogen, C1-C4-alkyl, C3-C8-cycloalkyl, CH2COOH, —CH2C(O)NH2, —OH or phenyl-C1-C4-alkyl;
• and
• R5 denotes hydrogen or C1-C6-alkyl.