[Pro9]-Substance P is a potent, reversible and selective agonist of NK-1 tachykinin receptors with an EC50 of 0.93 nM.

Narchinol B (Compound 4) is a sesquiter penoid compound. Narchinol B has anti-inflammatory effects. Narchinol B works by inhibiting proinflammatory mediators, including prostaglandin E2 (PGE2), inducible nitric oxide synthase (iNOS), and cyclooxygenase-2 (COX-2) proteins,as well as proinflammatory cytokines, such as interleukin-1b, IL-6, and tumor necrosis factor-α (TNF-α). Narchinol B significantly inhibits LPS-induced overproduction of NO in BV2 cells (IC50=2.43 μM).

Human proinsulin, the single-chain peptide precursor of insulin, consists of the insulin A and B chains connected by the 31 amino acid C-peptide. Cleavage of proinsulin by proteolytic enzymes produces insulin and free C-peptide.