Labeled inhibitors of prostate specific membrane antigen (PSMA), their use as imaging agents and pharmaceutical agents for the treatment of prostate cancer

A compound of Formula (Ia) or (Ib):

• wherein:
• n is chosen from 0 or 1;
• m is chosen from 1, 2, 3, or 4;
• X is chosen from Naphthyl, Phenyl, Biphenyl, Indolyl (=2,3-benzopyrrolyl), or Benzothiazolyl;
• Y is chosen from Aryl, Alkylaryl, Cyclopentyl, Cyclohexyl, or Cycloheptyl;
• and
• Z is independently chosen from —CO2H, —SO2H, —SO3H, —SO4H, —PO2H, —PO3H, or —PO4H2, with the proviso that the compound is not