» Technetium Tc 99m Sestamibi Injection is a sterile, aqueous solution of tetrakis(2–methoxy-isobutyl isonitrile) copper (I) tetrafluoroborate that is labeled with ^99m Tc suitable for intravenous administration. It contains not less than 90 percent and not more than 110 percent of the labeled amount of ^99m Tc as a complex with sestamibi, expressed in megabecquerels (or in milicuries) per mL at the time indicated in the labeling. It contains reducing agents, a buffer, and an inert filler. Other chemical forms of radioactivity do not exceed 10 percent of the total radioactivity.