These are provided compounds of formula I ##STR1## wherein A represents an oxygen or a sulphur atom, a bond or a group (CH.sub.2).sub.1 NR.sup.9 (where 1 represents zero or 1 and R.sup.9 represents a hydrogen atom or a methyl group); B represents a C.sub.1-4 alkylene chain optionally substituted by a hydroxyl group, except that the hydroxyl group and moiety A can not be attached to the same carbon atom when A represents an oxygen or sulphur atom or a group (CH.sub.2).sub.1 NR.sup.9, or when A represents a bond B may also represent a C.sub.2-4 alkenylene chain; R.sup.3 represents a hydrogen atom or a C.sub.1-4 alkyl group; m represents 1 or 2; R.sup.7 represents a hydrogen atom or R.sup.3 and R.sup.7 together form a group --(CH.sub.2).sub.n -- where n represents 1 or 2. These compounds can sensitize multidrug-resistant cancer cells to chemotherapeutic agents and may be formulated for use in therapy, particularly to improve or increase the efficacy of an antitumor drug.
这些化合物的
化学式为I ##STR1## 其中A代表氧原子或
硫原子,键或基团(CH.sub.2).sub.1 NR.sup.9 (其中1代表零或1,R.sup.9代表氢原子或甲基基团);B代表C.sub.1-4烷基链,可选择性地被羟基取代,但当A代表氧原子或
硫原子或基团(CH.sub.2).sub.1 NR.sup.9时,羟基和基团A不能附加在同一碳原子上,或当A代表键时,B也可以代表C.sub.2-4烯基链;R.sup.3代表氢原子或C.sub.1-4烷基基团;m代表1或2;R.sup.7代表氢原子或R.sup.3和R.sup.7一起形成一个基团--(CH.sub.2).sub.n--,其中n代表1或2。这些化合物可以使多药耐药癌细胞对化疗药物产生敏感性,可以用于治疗,特别是用于提高或增加
抗肿瘤药物的疗效。