H-D-Phe-Pip-Arg-pNA (S-2238) dihydrochloride, a chromogenic substrate, is patterned after the N-terminal portion of the A alpha chain of fibrinogen, which is the natural substrate of thrombin. H-D-Phe-Pip-Arg-pNA dihydrochloride is specific for thrombin and is used to measure antithrombin-heparin cofactor (AT-III). The AT-III assay using H-D-Phe-Pip-Arg-pNA dihydrochloride is sensitive, accurate, and easy to perform.

Y-29794 Tosylate is an orally active, effective, and specific non-peptide-prolyl endopeptidase (PPCE) inhibitor.

G-1749 does not alter the monomer-dimer equilibrium of IRE, stimulates the RNase activity of unphosphorylated IRE1 and inhibits IRE1-3P, and significantly increases the RNase activity of IRE1-KR-0P.