Compounds of the formula ##STR1## wherein R.sup.1, R.sup.1 ', R.sup.2, R.sup.2 ' R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are as described herein; as well as pharmaceutically acceptable prodrugs or salts of acidic compounds of formula I with bases and or basic compounds of formula I with acids are antiproliferative agents useful in the treatment of cancer.
式为##STR1##的化合物,其中R.sup.1,R.sup.1',R.sup.2,R.sup.2',R.sup.4,R.sup.5,R.sup.6和R.sup.7如本文所述;以及公认为适用于药用的化合物I的酸性衍
生物的前药或与酸性化合物I的碱和/或碱性化合物I的盐是抗增殖剂,可用于治疗癌症。