5-[(1H-indol-3-yl)methylidene]imidazolidine-2,4-dione ((4Z)-4-(1H-indol-3-ylmethylidene)-4H-imidazole-2,5-diol) is a marine derived natural products found in Leptopsammia pruvoti.

(D-Ala2,Met5)-β-Casomorphin (1-5) amide (bovine)

Calcitonin (8-32), salmon is a highly selective amylin receptor antagonist.Calcitonin is a hormone known to participate in calcium and phosphorus metabolism. In mammals, the major source of calcitonin is from the parafollicular or C cells in the thyroid gland. Calcitonin is a 32 amino acid peptide cleaved from a larger prohormone.