Krishna R, Wong P, Stevens C, De Lepeleire I, Van Dyck K, Rosen RC, Gendrano IN, Peeters M, Wagner JA, Herman GA. Lack of erectogenic activity of a novel selective melanocortin-4 receptor agonist in a clinical experimental model. J Clin Pharmacol. 2008 Oct;48(10):1237–41. doi: 10.1177/0091270008320925. PMID: 18559488.