PROBLEM TO BE SOLVED: To provide a simple purification method of a radioactive fluorine labeled compound and a labeled precursor compound.SOLUTION: There is provided a labeled precursor compound represented by the formula (2), where R1 is an alkyl group, an aryl group, a nitrogen-containing heterocycle or the like, R2 and R3 are a hydroxy alkyl group of which an alkyl group or a hydroxyl group are protected with a protection group or unprotected, n is an integer of 1 to 2, R6 is an alkyl group or a -CONR11R12 group, R11 and R12 are each independently an alkyl group or a substituted/unsubstituted monocyclic or condensed polycyclic aryl group and R4, R5, R7 and R8 are each independently H, an alkyl group or the like.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT
