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.

Fucoxanthin is a carotenoid that occurs naturally in certain algae.?It is found as an accessory pigment in the chloroplasts of brown algae and most other heterokonts, giving them a brown or olive-green color.It?shows anti-obesity, anti-oxidant, anti-diabetic, anticancer and anti-inflammatory activities.

Lycodoline is a natural product.