| 摘要 |
Compounds of the formula <IMAGE> in which R1 and R2 independently of one another denote hydrogen, lower alkyl or aryl or, taken together, denote lower alkylene, R3 and R4 independently of one another denote hydrogen, lower alkyl or aryl or, taken together, denote lower alkylene, and the ring A has no additional substituents or is additionally substituted by lower alkyl, lower alkoxy and/or halogen, are active in retrovirus-induced Rauscher leukaemia of the mouse and can therefore be used therapeutically, for example in the control of immune diseases or autoimmune diseases likewise caused by retroviruses. |
