Momordin II, an oleanane-type triterpene glycoside, is a ribosome inactivating protein. Momordin II inhibits cell-free protein synthesis, releases adenine from rat liver ribosomes and from DNA, and has no RNase activity.

N tau-methylhistamine is one of the histamine metabolites. N tau-methylhistamine in plasma and urine is a good parameter for histamine release and the determination of this histamine metabolite is generally less hampered by possible artifacts (due to basophil disrupture a very short half-life time or bacterial production) than determinations of histamine itself.

Norbraylin is a natural product from Toddalia asiatica.