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Lim, HD; Smits, RA; Bakker, RA; Van Dam, CM; De Esch, IJ; Leurs, R (2006). „Discovery of S-(2-guanidylethyl)-isothiourea (VUF 8430) as a potent nonimidazole histamine H4 receptor agonist.”. Journal of Medical Chemistry49 (23): 6650–1. DOI:10.1021/jm060880d. PMID17154494.