A muscarinic acetylcholine nervous system labeled compound for positron emission tomography measurement of the present invention has a structure represented by undermentioned general formula (I): <CHEM> Äin the formula, W represents one selected from the group consisting of groups represented by undermentioned formulae (II) and (III): <CHEM> <CHEM> (in the formulae, R represents one selected from the group consisting of an <11>C-labeled ethyl group and an <11>C-labeled propyl group), and in the case that W is a group represented by above-mentioned formula (II), above-mentioned formula (I) is the (+)-isomerÜ.
LABELED COMPOUNDS FOR MEASURING THE FUNCTION OF THE MUSCARINIC ACETYLCHOLINE NERVOUS SYSTEM