O-Acetylserine (OASS) is an acylated amino acid derivative. It is an intermediate in the biosynthesis of the common amino acid cysteine in bacteria and plants. Its presence in humans arises from either microbial metabolism in the gut or through consumption of foods containing OASS.

Regaloside A is a phenylpropane derived from lily of the valley that shows DPPH free radical scavenging activity at 160 ppm.

FEN1-IN-1 is an inhibitor of flap endonuclease 1 (FEN1). FEN1-IN-1 binds to the active site of FEN1. It partly achieves inhibition by the co-ordination of Mg2+ ions.