Figure 2.

Structure of technetium cores. Oxo cores (13 & 14) and a nitride core (15) are shown complexed with ^99mTc (V). “L” represents ligands that coordinate with the Tc cores to form the apex of the structure; the oxygen or nitrogen of the core form the pyramid base. In the case of ciprofloxacin labeling, the four ligand positions are occupied by two bidentate ciprofloxacin molecules, as shown in Figure 3.