| 摘要 |
Compounds of the formula I <IMAGE> in which A denotes a direct bond or -(CH2)n-, in which n represents 1, 2 or 3; X represents a -C(=Y)-NR6R7 radical; Y represents NR8, O or S; Z represents NR9, O or S; R1 and R2, independently of one another, denote hydrogen or one or more substituents other than hydrogen; the radicals R3, R4, R6, R8 and R9 independently of one another denote hydrogen or lower alkyl; and R5 and R7 independently of one another represent hydrogen, lower alkyl, hydroxyl, etherified or esterified hydroxyl or unsubstituted or mono- or disubstituted amino; tautomers thereof, and salts thereof. They have useful pharmaceutical properties and are particularly active against tumours. They are prepared in a manner known per se. |
