Pyridoxal isonicotinoyl hydrazine is a cell-permeable and relatively non-toxic iron (Fe3+) chelator that shows high iron chelation efficacy both in vitro and in vivo.

Carbazochrome sodium sulfonate (AC-17) is an antihemorrhagic for use in the treatment of hemorrhoids.

4-Hydroxy-6-methylcoumarin is a natural compound.