| 摘要 |
<p>A compound represented by general formula (I), a pharmaceutically acceptable salt or ester thereof, a process for the production thereof, and an antitumor agent containing the same as the active ingredient. In formula (I), R1 represents linear, branched or cyclic lower alkyl, or optionally fluorinated phenyl; R?2 and R3¿ represent each hydrogen, or linear, branched or cyclic lower alkyl; R4 represents hydrogen or N(R5)R6, wherein R?5 and R6¿ represent each hydrogen, or linear, branched or cyclic lower alkyl; X represents nitrogen or C-Y, wherein Y represents hydrogen, halogen, methyl or methoxy; m and n represent each an integer of 0 or 1; and ...... represents a single or double bond.</p> |
