| abstract |
The present invention provides a compound represented by formula (I):n nwherein n is an integer selected from 1 to 20, and R 1 and R 2 , which may be the same or different, each represent a hydrogen atom or a linear or branched C 1 -C 6 alkyl group, or a salt, a prodrug or a solvate thereof, as well as a drug, a pharmaceutical composition containing the compound, and the like. |