The synthesis of amselamine (2-amino-5-(2-aminoethyl)-4-methyl- 1,3-se
lenazole), a potent histamine H-2-agonist, has been described. At the
guinea pig right atrium amselamine revealed to be slightly more active
than Its sulfur analogue amthamine and histamine. Moreover negligible
effects on H-1 and H-3-receptors were observed.