| 摘要 |
PROBLEM TO BE SOLVED: To obtain a new GRK inhibitor useful as a prophylactic or a therapeutic agent for cardiac insufficiency, etc. SOLUTION: This GRK inhibitor comprises a compound represented by the formula (I) [A denotes a nitrogen-containing heterocyclic ring which may further be substituted; R1 and R2 denote each amino group which may respectively be substituted; X denotes a spacer in which the number of atoms constituting the straight-chain part is 1-4; and R1 may be bound to R2 or/and X to form a ring], or its salt or a prodrug thereof.
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