Compounds of the formula (I), in which Het, R, X, Y, R
1
and p have the meanings indicated in claim
1
, are autotaxin inhibitors and can be employed for the treatment of tumours.
The present invention relates to novel compounds that are autotaxin inhibitors, processes for their preparation, pharmaceutical compositions and medicaments containing them and to their use in the treatment of an ATX-dependent or ATX-mediated disease or condition.