Mugineic acid is the organic compound consisting of a azetidine group and three carboxylates.
More specifically, it is a phytosiderophore, i.e. a plant-produced siderophore.
It functions as an iron accumulating agent for barley and other plants.
Related phytosiderophores include nicotianamine and avenic acid.
The compound binds metal ions as a hexadentate ligand.