FUROISOQUINOLINE DERIVATIVE, METHOD FOR PRODUCING THE SAME AND USE

摘要

PROBLEM TO BE SOLVED: To provide an excellent phosphodiesterase IV inhibitor. SOLUTION: The compound having the partial structure represented by the formula 1 or its salt and a compound represented by the formula 2 [in the formulas 1 and 2, R<1> represents an optionally substituted hydrocarbon group or the like; R<2> and R<3> each represents an optionally substituted hydrocarbon or the like; R<4> and R<5> each represents hydrogen atom or the like; R<6> and R<7> each represents an optionally substituted hydrocarbon group; R<8> represents hydrogen atom, -OR<10> (R<10> represents an optionally substituted hydrocarbon group or the like); R<9> represents hydrogen atom or the like; X represents optionally substituted methylene group or the like; and n is 0 or 1] or its salt are provided.