Demethoxypiplartine 是一种酰胺类生物碱，可从 Piper flaviflorum 和 Piper sarmentosum 中分离得到。Demethoxypiplartine 对 Cryptococcus neoformans 具有抗真菌 (antifungal) 活性，其 IC50 为 18.1 μg/mL。

Endogenous high affinity agonist for human NPY Y4 receptor (Ki = 0.056 nM). Believed to play an important role in the function of the gastrointestinal tract.

Endogenous central calcitonin (CT) receptor agonist that stimulates cAMP formation at a potency 350-fold greater than CT (ED50 values are 0.2 and 71 nM respectively). Displays no activity at calcitonin-gene related peptide (CGRP) and adrenomedullin receptors. Inhibits formation of multinuclear osteoclasts with similar efficacy to CT in vitro. Suppresses food intake and increases body temperature in free-feeding rats, and significantly decreases plasma calcium levels in vivo.