PROBLEM TO BE SOLVED: To provide an inhibitor of hepatitis B virus (HBV) replication. SOLUTION: The compound represented by the formula (ID), its stereoisomer, salt, hydrate and solvate. (In the formula, X is CR7; R7 is H, CN, F and the like; Ra to Rc are H, F, Br, CHF2 and the like; Rd is H or F; R4 is H, C1 to C3 alkyl and the like. R5 is H; R6 is C2-C6 alkyl, etc.) [Selection diagram] None【課題】B型肝炎ウイルス(HBV)複製の阻害剤の提供。【解決手段】式(ID)で表される化合物、その立体異性体、塩、水和物、溶媒和物。(式中、Xは、CR7;R7は、H、CN、F等;Ra~Rcは、H、F、Br、CHF2等;Rdは、H又はF;R4は、H、C1~C3アルキル等;R5はH;R6はC2~C6アルキル等を表す。)【選択図】なし