Synthesis of ipratropium bromide metabolites is described. ... Synthesis of ipratropium bromide metabolites is described. ... Ipratropium bromide, (endo, syn)??(±)??3??(3??hydroxy??1??oxo??2??phenylpropoxy )??8??methyl??8??(1??methylethyl)??8??azoniabicyclo [3.2.1] octane bromide 10, belongs to the group of tropane alkaloids. It is in fact a diastereomer of the N??isopropyl quaternary salt of atropine 8S??ipratropium bromide 18. As depicted in Fig. 1, the isopropyl group in ipratropium ...