Compounds of formula (I) in which R1, R2 and R3, which may be the same or different, represent alkyl C1-6, cycloalkyl C3 - 7, aryl or NHR4, wherein R4 may represent any of the values that any of R1, R2 or R3 may represent; additionally, R3 may represent hydrogen, and pharmaceutically acceptable salts thereof, and their therapeutic use, eg in the treatment of cancer.
化学式(I)中的化合物,其中R1、R2和R3,可以相同也可以不同,代表烷基C1-6、环烷基C3-7、芳基或NHR4,其中R4可以代表R1、R2或R3中的任何一个值;此外,R3可以代表氢,并且其药用盐,以及它们在治疗癌症等方面的治疗用途。