Patent ID: 8679459

Claim:
A tetrapyrrolic compound selected from the group consisting of: wherein R is —COCH3 or —CH(OR 3 )CH 3 ; where R 3 is a saturated or unsaturated alkyl chain with 1-8 carbon atoms, polyethylene glycol (PEG) with carbon chain of 1-8 carbon atoms, or halogen (Cl, Br, I or F)-substituted phenyl ring containing saturated or unsaturated alkyl chain with 1-8 carbon atoms as a linker or the corresponding I-124, I-125, I-131 or F-18 radionuclide; R 1 is COOH or COOR 4 where R 4 is C 1-8 alkyl or substituted C 1-8 alkyl; R 2 is O or N—R 5 where R 5 is C 1-8 alkyl; and M is 2H, Ga, Pd, Al, Zn, Cu or the radioisotopes of Ga, Pd, Al, Zn, and Cu for positron emission tomography (PET) or single-photon emission computed tomography (SPEDT).