The invention relates to crystalline, water-free (1 alpha ,2 beta ,4 beta ,5 alpha ,7 beta )-7-[(hydroxydi-2-thienylacetyl)oxy]-9,9-dimethyl-3-oxa-9-azoniatricyclo[3.3.1.0<;2,4>;]nonane-bromide, to a method for its production, and to the use thereof in the production of a drug, especially in the production of an anticholinergic drug.