The osmolality of<unk>  ranges from 322 mOsm/kg—approximately 1.1 times that of blood plasma—to 844 mOsm/kg, almost three times that of blood. Despite this difference,<unk>  is still considered a low-osmolality contrast agent; the osmolality of older agents, such as diatrizoate, may be more than twice as high.
Iohexol
Iofetamine 
Gadodiamide
Methohexital
Flonicamid
Indapamide
Doxylamine
Adenosine