The present invention provides a radiolabeled ligand which is highly selective and potent for glutamate transporters and is usable in specifically detecting the glutamate transporter.
Specifically, the present invention provides a 3-[3-(benzoylamido)benzyloxy]aspartic acid having a radioactive substituent on the benzoyl group which is represented by the following formula (1), or an ester or salt thereof:
wherein X represents a substituent containing a radioactive atom(s) which is selected from a straight or branched lower aliphatic alkyl group, a hydroxyl group, a straight or branched lower aliphatic alkoxy group, an amino group, a straight or branched lower aliphatic acylamido group, a halogen atom and a straight or branched lower aliphatic haloalkyl group; and R
1
and R
2
each represents a hydrogen atom, a straight or branched lower aliphatic alkyl group or an acetoxymethyl group.
                            本发明提供了一种放射性标记的
配体,其对谷
氨酸转运体高度选择性和强效,并可用于特异性检测谷
氨酸转运体。具体而言,本发明提供了一种在苯甲酰基基团上具有放射性取代基的3-[3-(苯甲酰胺)苄氧基]
天冬氨酸,其表示为以下式子(1),或其酯或盐:其中X代表含有放射性原子的取代基,所述取代基选自直链或支链低级脂肪基烷基、羟基、直链或支链低级脂肪基氧基烷基、
氨基、直链或支链低级脂肪酰胺基、卤原子和直链或支链低级脂肪卤代烷基;而R1和R2分别代表氢原子、直链或支链低级脂肪基烷基或乙酰氧甲基基团。