NOVEL HETEROCYCLIC DERIVATIVE

摘要

The present invention relates to a compound represented by the following general formula (1) [wherein X represents an oxygen atom, an imino group, a sulfur atom, sulfinyl, or sulfonyl, R1, R2, and R3 each independently represent a hydrogen atom or a C1-6 alkyl group, R4 represents a hydrogen atom, a C1-6 alkyl group, or an arylalkyl group, R5 represents an alkyl, alkenyl, alkynyl, aryl, or heteroaryl group]. This compound has excellent EPO-production acceleration activity and is useful as a pharmaceutical.