Abstract Nine salts of 1-(8α-ergolinyl)-3, 3-diethylurea (II) were prepared and their solubility in water and the stability of the aqueous solutions at 60 and 100 C were studied. The main product of hydrolysis is 6-methyl-8α-aminoergoline IV. The urethan VII is formed in the ethanolic solution. Both decomposition products are also formed under long-term storage at+ 5 C. The course of hydrolysis of N-propyl homologue III is similar. The decomposition ...