A precursor of a molecular probe for imaging of pancreatic islets is a compound expressed as the following formula (I): wherein -V-X represents a substituent on a benzene ring, V represents a bond, R 1 , or OR 1 , R 1 represents a C 1 -C 6 alkylene group, R 2 represents H (hydrogen atom), a C 1 -C 6 alkyl group, a C 7 -C 10 aralkyl group, or a protecting group, X represents a OMs group, a OTs group, a OTf group, Br (bromine atom), or I (iodine atom), and carbon marked with * is an asymmetric carbon atom.