Demethoxypiplartine is an amide alkaloids which can be isolated from Piper flaviflorum and Piper sarmentosum. Demethoxypiplartine has antifungal activity against Cryptococcus neoformans with the IC50 of 18.1 μg/mL.

YPC-22026 has potential anticancer activity, inducing tumor regression in a mouse xenograft model while inhibiting ZNF143-regulated genes.

Morphiceptin is a potent and specific agonist for morphine (μ) receptors. Morphiceptin, as a synthetic peptide, is the amide of a fragment of the milk protein β-casein. Morphiceptin has morphinelike activities and is highly specific for morphine (μ) receptors but not for enkephalin receptors.