Hyoscine Butylbromide EP Impurity D (Mixture of Diastereomers)

(1R,2R,4S,5S,7s,9S)-9-butyl-7-(((S)-3-hydroxy-2-phenylpropanoyl)oxy)-9-methyl-3-oxa-9-azatricyclo[3.3.1.02,4]nonan-9-ium bromide