| 摘要 |
PCT No. PCT/JP95/01934 Sec. 371 Date Feb. 4, 1998 Sec. 102(e) Date Feb. 4, 1998 PCT Filed Sep. 25, 1995 PCT Pub. No. WO96/10024 PCT Pub. Date Apr. 4, 1996The present invention provides a novel compound which is represented by formula (I): <IMAGE> (I) wherein preferable examples of R1 to R6 are as follows; R1 and R2 are each an alkyl group optionally substituted by a halogen atom, an amino group, a hydroxyl group, an alkoxyl group or a thiol group, a hydrogen atom, a halogen atom or an alkoxyl group; R3 is a hydrogen atom; R4 is a methyl group; R5 is a hydrogen atom or an alkyl group; and R6 is a group of the formula: <IMAGE> wherein Z is a phenyl group; and has an antitumor effect.
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