Patent ID: 7745473

Claim:
An indole derivative represented by general formula (1): wherein R 1 represents by the following formula: (wherein in formula (4), R 3 represents a hydrogen atom, a peptide chain, a carbohydrate chain, or a polyethylene glycol group; and E represents an elimination group selected from the group consisting of a halogen atom, a mesyl group, and a tosyl group); R 2 represents a hydrogen atom, an alkyl group, or an acyl group; and X represents a divalent group having two or more constitutional units which may be the same or different, the constitutional unit being represented by the following formula: (wherein m is an integer of 0 to 10), wherein among the constitutional units, a terminal constitutional unit adjacent to R 2 may be a constitutional unit represented by the following formula: (wherein k is an integer of 0 to 10).