COMPOUND EXCELLENT IN SELECTIVE ACCUMULATION TO UNSTABLE PLAQUE

摘要

PROBLEM TO BE SOLVED: To provide a compound excellent in selective accumulation to an unstable plaque.SOLUTION: There is disclosed a compound expressed by formula (1) or a salt thereof. In the formula, Ais oxygen or an NH group; Rand Rare hydrogen or a radioactive halogen substituent, provided that only either of Rand Ris the radioactive halogen substituent; Ris hydrogen or a methoxy group.