Pancreatic Polypeptide, rat is an agonist of NPY receptor, with high affinity at NPYR4. Pancreatic polypeptide (PP) is a 36-amino acid, C-terminally amidated peptide, and is a member of the PP-fold peptide family. It is produced and secreted by the PP cells of the islets of Langerhans.

(25S)-12β-Hydroxyspirost-4-en-3-one is a natural compound that can be isolated from Dioscorea chiupasensis.

SP-13786 is an inhibitor of fibroblast activation protein (FAP) (IC50 : 3.2 nM); also inhibits prolyl oligopeptidase (PREP) ( IC50 : 1.8 μM).