Piperolactam A is a natural product that can be isolated from root of Piper betle. Piperolactam A exhibits promising leishmanicidal action against wild type and drug resistant strains of Leishmania donovani.

2-O-cinnamoyl-beta-D-glucose

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.