ACTH (1-17), an adrenocorticotropin analogue, is a potent human melanocortin 1 (MC1) receptor agonist with a Ki of 0.21 nM. Adrenocorticotropic hormone (ACTH), also known as corticotropin, is produced and secreted by the anterior pituitary gland.

Gomisin O is a natural product from Schizandra chinensis.

(-)-Fargesol is a nartural product from the flowers buds of Magnolia fargesii,the dried flower buds of M. fargesii, has been used as therapy for nasal empyema and headache.