A restenosis inhibiting agent for the treatment or prevention of restenosis after percutaneous transluminal coronary angioplasty which comprises a pharmaceutically effective amount of a compound of the following general formula or a pharmaceutically acceptable salt thereof as an active ingredient: (I) wherein R is an imidazolyl group, a thiazolyl group or a pyridyl group, n is an integer of 1 or 2, and m is an integer of 1 to 4.
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