Abstract: Disclosed is a compound which has a low molecular weight and has an activity of enhancing the production of EPO and/or an activity of enhancing the production of hemoglobin.

Abstract: Disclosed is a compound which has a low molecular weight and has an activity of enhancing the production of EPO and/or an activity of enhancing the production of hemoglobin.

Abstract: Disclosed is a compound which has a low molecular weight and has an activity of enhancing the production of EPO and/or an activity of enhancing the production of hemoglobin.

Abstract: The present invention provides a low molecular weight compound having EPO production-promoting action and/or hemoglobin production-promoting action. The present invention relates to a fused piperidine compound represented by the following general formula (1): (wherein, ring A represents a C10-14 aryl group or 5- to 10-membered heterocyclic group, X represents N—R7, a sulfur atom or an oxygen atom, R1, R2, R2?, R3 and R3? independently represent a hydrogen atom, C1-6 alkyl group or C3-6 cycloalkyl group, and R4, R5 and R6 independently represent a hydrogen atom or halogen atom), or a salt thereof, or a solvate thereof.

Abstract: The present invention provides a low molecular weight compound having EPO production-promoting action and/or hemoglobin production-promoting action. The present invention relates to a fused piperidine compound represented by the following general formula (1): (wherein, ring A represents a C10-14 aryl group or 5- to 10-membered heterocyclic group, X represents N—R7, a sulfur atom or an oxygen atom, R1, R2, R2?, R3 and R3? independently represent a hydrogen atom, C1-6 alkyl group or C3-6 cycloalkyl group, and R4, R5 and R6 independently represent a hydrogen atom or halogen atom), or a salt thereof, or a solvate thereof.

Abstract: Disclosed is a compound which has a low molecular weight and has an activity of enhancing the production of EPO and/or an activity of enhancing the production of hemoglobin.

Abstract: Disclosed is a low-molecular-weight compound having an EPO production-promoting activity and/or a hemoglobin expression-enhancing activity. Specifically disclosed is an EPO production promoter and/or a hemoglobin expression enhancer comprising a 1-acyl-4-(phenoxy, benzyloxy or phenylamino)-1,2,3,4-tetrahydroquinoline derivative, more specifically a tetrahydroquinoline compound represented by the general formula (1); [wherein R1, R2, R2?, R3 and R3? independently represent a hydrogen atom, a C1-6 alkyl group, or the like; R4, R5, R6, R7, R8, R9 and R10 independently represent a hydrogen atom, a halogen atom, a C1-6 alkyl group, or the like; A represents N—R11 or an oxygen atom; R11 represents a hydrogen atom, a C1-6 alkyl group, or the like; and n represents an integer of 0 or 1], a salt of the tetrahydroquinoline compound, or a solvate of the tetrahydroquinoline compound or the salt.