Glychionide A is a natural product.

Rhododendrol is a melanin synthesis and acts by preventing high-fat diet-induced elevation in body weight and increasing lipolysis in white adipocytes in male mice.

5-Hydroxymethyl-2-furancarboxylic acid (Sumiki's acid) is a naturally occurring human metabolite. Sumiki's acid was first identified in the urine of a leukemia patient who was excreting an abnormal amount of its glycine derivative. Sumiki's acid has been found to be a byproduct of the fungus Aspergillus and probably other species of fungi and yeast as well.