| abstract |
Provided is a compound represented by formula (I) or a pharmacologically acceptable salt thereof: n n n n n n n n n n wherein L 1 is an optionally substituted C 1-6 alkylene group or the like, L 2 is a single bond or the like, L 3 is a single bond or the like, R 1 , R 2 , and R 3 are each independently an optionally substituted C 1-4 alkyl group or the like, R 4 is a hydrogen atom or the like, and R 5 is a hydrogen atom or the like. |