Bursin is a peptide that can be isolated from the bursa of Fabricius of chicken. Bursin induces the phenotypic differentiation of mammalian and avian B precursor cells. Bursin also increases cyclic guanosine monophosphate in cells of the human B-cell line Daudi, its derivatives are able to protect against infection by amplifying the immune response induced by H9N2.

Angelicin, is a furanocoumarin with anti-Y, antiviral, anti-inflammatory activity.

Methyl 4-bromopyrrole-2-carboxylate is a marine derived natural products found in Lissodendoryx sp.