| abstract |
The present invention provides compounds usuful for prevention, treatment or allevation of diseases against which activation of the thrombopoietin receptor is effective. n A compound represented by the formula (1):n nwherein A, B, R 1 , L 1 , R 2 , L 2 , L 3 , Y, L 4 , R 3 and X are the same as defined in the description, a tautomer, prodrug or pharmaceutically acceptable salt of the compound or a solvate thereof. |