Crystalline fumaric acid salts of 3,7-bis (substituted aza) spiro bicyclo 3.3.1 nonane-9, 1-cycloalkane their preparation and pharmaceutical compositions containing them

摘要

1,5-Fumaric acid salts of N,N'-di-lower alkyl-substituted 9,9-alkylene-3,7-diazabicyclo[3.3.1]nonanes are described. The salts are obtained in stoichiometrically pure form and are virtually non-hygroscopic.