abstract |
Provided is a compound represented by formula (I), a pharmaceutically acceptable salt thereof or a solvate thereof. Formula (I) (In the formula: R1 and R2 are each 5 independently selected from the group consisting of hydrogen, alkyl, alkenyl, acyl and hydroxyalkyl; R3 is hydrogen or halogen; ring A is a benzene ring or a pyridine ring; ring B is selected from the group consisting of formulas (i), (ii), (iii) and (iv), wherein in formula (ii), Ra is an alkyl; R4 and R5 are each independently selected from the group consisting of hydrogen, hydroxy, alkoxy, haloalkoxy, 10 halohydroxyalkoxy and aminoalkyl; and BB represents a double bond or a triple bond.) This compound can be used as a molecular probe for imaging tau protein that is accumulated in the brain. <filename> |