tiotropium
tiotropium
A quaternary ammonium ion obtained by methylation of the tertiary amino group of (1α,2β,4β,5α,7β)-7-[(hydroxydi-2-thienylacetyl)oxy]-9-methyl-3-oxa-9-azoniatricyclo[3.3.1.0<small><sup>2,4</small></sup>]nonane. Used (in the form of the bromide hydrate) for maintenance treatment of airflow obstruction in patients with chronic obstructive pulmonary disease.