A pharmaceutical compositions comprises a compound of formula (I):
or a pharmaceutically acceptable salt thereof: wherein
R
1
═R
2
═H; or R
1
and R
2
together form a moiety represented by the formula
R
3
represents a substituted or unsubstituted alkyl having 4-30 carbon atoms, or a substituted or unsubstituted aryl group having 3-30 carbon atoms; and
R
4
represents a substituted or unsubstituted aryl group having 3-30 carbon atoms;
with the proviso that R
3
is not butyl, pentyl, tetrahydropyranyloxymethyl, tetrahydropyranyloxypropyl or phenyl when R
1
═R
2
═H and R
4
is o-cyanophenyl,; and with the proviso that R
3
is not butyl when R
1
═R
2
═H and R
4
is phenyl.
The pharmaceutical composition may be used to treat a subject afflicted with a tumor/cancer by inhibiting topoisomerase I activities or blocking the S phase or G
2
/M phase of the tumor/cancer cells.
一种药物组合物包括式(I)的化合物或其药学上可接受的盐:其中R1═R2═H; 或R1和R2一起形成由式表示的基团R3代表具有4-30个碳原子的取代或未取代的烷基,或具有3-30个碳原子的取代或未取代的芳基基团; 和R4代表具有3-30个碳原子的取代或未取代的芳基基团; 前提是当R1═R2═H且R4为o-
氰基苯基时,R3不是丁基,戊基,
四氢吡喃氧甲基,
四氢吡喃氧丙基或苯基; 前提是当R1═R2═H且R4为苯基时,R3不是丁基。该药物组合物可用于通过抑制拓扑异构酶I活性或阻断肿瘤/癌细胞的S期或G2/M期来治疗患有肿瘤/癌症的受试者。