The invention relates to a compound of formula wherein the variables have the meaning as indicated in the claims; in free form and in salt form; and optionally the enantiomers and geometrical isomers thereof. The compounds of formula (I) are useful as therapeutic agent for organ transplants, lupus, multiple sclerosis, rheumatoid arthritis, psoriasis, Type I diabetes and complications from diabetes, cancer, asthma, atopic dermatitis, autoimmune thyroid disorders, ulcerative colitis, inflammatory bowel diseases, Crohn's disease, Alzheimer's disease, leukemia, osteoarthritis, control of pruritus, chronic respiratory disease or keratoconjunctivitis in mammals.