Tyroserleutide hydrochloride is a small molecule tripeptide isolated from the degradation product of pig spleen, which can inhibit tumor growth in vivo and in vitro.

TCS PrP Inhibitor 13 is an antiprion agent inhibiting protease-resistant prion protein (PrP-res) accumulation.

3-hydroxybutyric acid is involved in the synthesis and degradation of ketone bodies. Like the other ketone bodies (acetoacetate and acetone) levels of beta-hydroxybutyrate are raised in the blood and urine in ketosis. Beta-hydroxybutyrate is a typical partial-degradation product of branched-chain amino acids (primarily valine) released from muscle for hepatic and renal gluconeogenesis.