Phenylalanylalanine (H-Phe-Ala-OH) is a dipeptide composed of phenylalanine and alanine. Phenylalanylalanine is an incomplete breakdown product of protein digestion or protein catabolism.

GS-6620 PM is a derivative of GS-6620, an orally administered anti-hepatitis C virus polymerase inhibitor and a novel potent C-nucleoside adenine analogue monophosphate prodrug.

Amifostine is the first approved radioprotective drug, used to decrease the risk of kidney problems caused by treatment with cisplatin.