Gadolinium(III) chloride hexahydrate is a contrast agent in magnetic resonance imaging and can be used in medicine, magnetic resonance imaging, liquid crystal displays and other fields.

DPPH is a cell-permeable, stable free radical that is commonly used to evaluate the ability of compounds to act as free radical scavengers or hydrogen donors and to measure the antioxidant activity of tissue extractsDPPH shows a strong absorption band at 517nm.

Metanephrine is an o-methylated metabolite of catecholamines and can be used as a marker for different hereditary pheochromocytomas.