Hyoscine butylbromide Imp G (EP):(1R,2R,4S,5S,7s,9r)-9-butyl-9-methyl-7-[(2-phenylprop-2-enoyl)oxy]-3-oxa-9-azoniatricyclo[3.3.1.0 2,4]nonane (apo-N-butylhyoscine).