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A selection of established 99mTc radiopharmaceuticals and core structures (if known): TcMDP (14), Tc(V)DMSA (15), TcDMSA (16), TcDTPA (17), TcHIDA (18) TcMAG3 (19), Tc(V)-nitridobis(dithiocarbamate) (20), Tc(I)-tricarbonyl (21), Tc(I)-hexakis(isonitrile) (22), Tc(V)-hynic (23), Tc(VII)-trioxo (24), and Tc(V)-dioxo (25). Structures of 15, 19, 20, 21, 22, 24 and 25 are known and well defined; the others are not clearly defined.
