| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a drug or a contrast medium having high blood brain barrier permeability. Ž<P>SOLUTION: The drug comprises a compound represented by the formula (wherein R1 is hydrogen, an alkyl group or the like; X is oxygen, an alkylene group, N(R2), CO, COO, CONH, SO<SB>2</SB>, SO<SB>2</SB>NH or SO<SB>3</SB>; R2 is hydrogen or the like; n is an integer of 1-3; and Str is a residue of a drug compound which exhibits pharmacological action in the brain or a residue of a contrast medium) or a pharmaceutically acceptable salt thereof as an active ingredient. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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