[{"from": "human", "value": "Provide a brief overview of this molecule. [13NH3]"}, {"from": "gpt", "value": "The molecule is a (13)N-modified compound that is ammonia that has a (13)N isotope as the nitrogen atom. (13)N decays with a half-life of ten minutes to (13)C, emitting a positron. Used in diagnostic Positron Emission Tomography (PET) imaging. It has a role as a radioactive imaging agent."}]