Retene (NSC-26317) is widely present in recent and ancient sediments, and compounds can be extracted from fir forest soils, humic coals, terrestrial petroleum hydrocarbon source rocks, and deep-sea sediments.Retene is produced by dehydrogenation of pine acids during petrogenesis.

Granuliberin R is a new mast cell degranulating peptide comes from amphibian, can be isolated from the skin of frog Rana rugosa. Granuliberin R is a dodecapeptide, can act on rat peritoneal mast cell to liberate granules and release histamine.

Perseitol is a sugar that is specific to avocado honey. Perseitol have recently been reported as candidate biomarkers for avocado intake.