PROBLEM TO BE SOLVED: To provide a spleen tyrosinase (SYK) inhibitor used in treatment of disorders, diseases, cancers and the like including rheumatoid arthritis which involve an immune system and inflammation, and to provide a pharmaceutical composition containing the same.SOLUTION: There are provided a compound represented by formula 1 or its pharmaceutically acceptable salt, or a pharmaceutical composition containing them. The compound can be used in rheumatoid arthritis, malignant hematologic disorders, epithelial cancer and other disorders and diseases. In formula 1, G is N or C; Land Leach independently NH or a bond; Rand Reach independently H, halogen, alkyl or the like; Ris substituted/unsubstituted alkyl, heteroaryl or the like; Ris substituted/unsubstituted cycloalkyl, heteroaryl or the like; and Ris H, halogen, cyano or the like.SELECTED DRAWING: None【課題】関節リウマチ等の免疫系及び炎症にかかわる障害、疾患及び癌等の治療に用いる、脾臓チロキシナーゼ(SYK)阻外剤及び、それらを含有する医薬組成物の提供。【解決手段】式1で表される化合物又はその薬学的に許容できる塩或いはそれらを含有する医薬組成物。該化合物は、関節リウマチ、血液悪性疾患、上皮性癌、及びその他の障害、疾患に使用できる。(GはN又はC1;L1及びL2は各々独立にNH又は結合、R1及びR2は各々独立にH、ハロゲン、アルキル等;R3は置換/非置換のアルキル、ヘテロアリール等;R4は置換/非置換のシクロアルキル、ヘテロアリール等;R5はH、ハロゲン、シアノ等)【選択図】なし