| 摘要 |
PROBLEM TO BE SOLVED: To provide a spleen tyrosine kinase (Syk) inhibitor for use in the treatment of diseases such as inflammatory diseases, allergic diseases, cell proliferative disease, autoimmune disease or cytopenia.SOLUTION: Provided is a pyridopyrazine compound represented by formula (I), a racemic mixture, enantiomer, diastereomer and tautomer thereof, or a mixture thereof, or a salt thereof, as well as a pharmaceutical composition containing the same, and a method of use therefor. (R1 is hydrogen, halo or the like; R2 is optionally substituted aryl, heteroaryl or the like; and R3 and R4 are hydrogen, optionally substituted lower alkyl or the like.).SELECTED DRAWING: None |
