| abstract |
A compound effective in the prevention, treatment, or alleviation of diseases in which thrombopoietin receptor activation is effective. It is a compound represented by the formula (1) (wherein A, B, R<1>, L<1>, R<2>, L<2>, L<3>, Y, L<4>, R<3>, and X are as defined in the description), a tautomer or prodrug of the compound, a pharmaceutically acceptable salt of either, or a solvate of these. |