| abstract |
(57) [Summary] [Purpose] [Structure] General formula [Chemical formula 1] A lower hydrocarbon group which may have a substituent) or a methylene group which may have a substituent, i represents an integer of 1 to 3, and R 1 and R 2 are each a repeating number of i. It may be different. ] The compound or its salt represented by these, its manufacturing method, or agent. [Effect] Excellent anti-cancer agent |