Also within this realm are synthetically prepared organometallic compounds that serve as new drugs and imaging agents (technetium-99m sestamibi) as well as the principles relevant to the toxicology of organometallic compounds (e.g., methylmercury).
This passage discusses synthetic organometallic compounds used in medicine as drugs or imaging agents, such as technetium-99m sestamibi, and highlights the importance of understanding their toxicological effects, exemplified by the example of methylmercury.