The present invention relates to compounds of formula (I),,wherein R1, R2and R3are as described herein, and their prodrugs or pharmaceutically acceptable salt, enantiomer or diastereomer thereof, for (use in) the treatment and/or prophylaxis of liver cancer.本發明係關於式(I)化合物,,其中R1、R2及R3如本文所描述,及其前藥或其醫藥學上可接受之鹽、對映異構體或非對映異構體,其用於(用以)肝癌之治療及/或預防。