Compounds of the formula (I) in which D, R
1
, R
2
, R
3
, R
4
have the meanings indicated in Claim
1,
are inhibitors of tyrosine kinases, in particular of Met kinase, and can be employed, inter alia, for the treatment of tumours.
Compounds of formula (I):
and their salts, solvates, hydrates and prodrugs are useful PCP inhibitors, processes for making the same, compositions comprising the same, and methods of treating a PCP-mediated condition or disease using the same.