| abstract |
A compound having strong antitumor activity. It is a compound represented by the formula (I) or a pharmaceutically acceptable salt or solvate thereof: (I) wherein X and Z each represents CH or nitrogen; Y represents oxygen or sulfur; R?1, R2, and R3¿ each represents hydrogen, alkoxy, etc.; R4 represents hydrogen; R?5, R6, R7, and R8¿ each represents hydrogen, halogeno, alkoxy, etc.; R?9 and R10¿ each represents hydrogen, alkyl, etc.; and R11 represents optionally substituted azolyl. |