The invention provides a compound having the formula (1):
and salts thereof; wherein:
R1 is hydrogen or C1-2 alkyl; and
R2, R3 and R4 are the same or different and each is selected from hydrogen, C1-2 alkyl, fluorine, chlorine, C1-2 alkoxy and trifluoromethyl, provided that no more than two of R2, R3 and R4 are other than hydrogen.
Also provided are pharmaceutical compositions containing the compounds and their use in medicine, and in particular in the treatment of cancer.
本发明提供具有式(1)的化合物及其盐;其中:R1是氢或C1-2烷基;而R2、R3和R4相同或不同,且每个选自氢、C1-2烷基、
氟、
氯、C1-2烷氧基和三
氟甲基,但R2、R3和R4中不超过两个不是氢。还提供了含有这些化合物的制药组合物及其在医学上的使用,特别是在癌症治疗方面的使用。