Compounds of the formula (I), in which R1, R2, R3 and R4 have the meanings indicated in claim (1), are inhibitors of cell proliferation/cell vitality and can be employed for the treatment of tumors.
公式(I)的化合物,在其中R1,R2,R3和R4具有权利要求(1)所示的含义,可作为细胞增殖/细胞活力的
抑制剂,并可用于肿瘤的治疗。