摘要:
A compound having strong antitumor activity. It is a compound represented by the formula (I) or a pharmaceutically acceptable salt or solvate of the compound: (I) [wherein X is CH or nitrogen; Z is oxygen or sulfur; L is oxygen or sulfur; M is CR10R11 (R10 and R11 each is hydrogen, alkyl, or alkoxy) or NR12 (R12 is hydrogen or alkyl); R1, R2, R3 each is hydrogen or optionally substituted alkoxy; R4 is hydrogen; R5 to R8 each is hydrogen, halogeno, alkoxy, etc.; and R9 is -R14, alkyl optionally substituted by -T-R15 or -NR16R17 (T is oxygen, sulfur, or NH; R14 is an optionally substituted carbon ring or heterocycle; and R15 to R17 each is alkyl or an optionally substituted carbon ring or heterocycle), -NR18R19 (R18 and R19 each is hydrogen, optionally substituted alkyl, or an optionally substituted carbon ring or heterocycle), or an optionally substituted carbon ring or heterocycle].