| abstract |
According to the present invention, in the formula (I) [wherein, n is an integer selected from 1 to 20, R 1 and R 2 may be the same or different, and are a hydrogen atom, or a straight or branched chain having 1 to 6 carbons. A branched chain alkyl group is shown. ] The compound represented by these, its salt, a prodrug, and a solvate, and a pharmaceutical agent, a pharmaceutical composition, etc. containing the said compound are provided. |