RES-701-1 is a cyclic peptide composed of 16 common L-amino acids, acting as a specific antagonist for the ETB receptor. RES-701-1 can inhibit the binding of 125I-ET-1 (125I-labeled Endothelin (ET)-1) to the ETB receptor, with an IC50 value of 10 nM.

PF-04859989 HCl is a brain-penetrable and irreversible inhibitor of kynurenine amino transferase II (KAT II), which is the enzyme responsible for most of the brain synthesis of kynurenic acid.

4-Amino-5-Bromopyrrolo[2,3-D]Pyrimidine is a marine derived natural products found in Echinodictyum sp.