[Problem] The purpose of the present invention is to provide: an 11C-labelled catechol derivative exhibiting sufficient radioactivity for obtaining imaging images using a PET device; a PET probe for a phosphorylated tau aggregation inhibitor using same; and production methods therefor. [Solution] This 11C-labelled catechol derivative is represented by general formula (a) (with the caveat that R represents a substituent having an isopropylamino group, and the carbon in position 2 of the isopropylamino group is labelled with 11C). In particular, the 11C-labelled isoproterenol represented by structural formula (b) (in the formula, the carbon indicated by * is labelled with 11C) can be used as a PET probe for examining in vivo kinetics of isoproterenol which has the effect of inhibiting aggregation of tau proteins, and thus is very useful for researching dementia.
11C-LABELLED CATECHOL DERIVATIVE, POSITRON EMISSION TOMOGRAPHY (PET) PROBE FOR PHOSPHORYLATED TAU AGGREGATION INHIBITOR USING SAME, AND PRODUCTION METHODS THEREFOR