4-[2-({2-[(1S,2R,5S)-6,6-dimethylbicyclo[3.1.1]heptan-2-yl]ethyl}oxy)ethyl]-4-[(2-bromo-4,5-dimethoxyphenyl)methyl]-1,4-oxazinan-4-ium 4-[2-({2-[(1R,2S,5R)-6,6-dimethylbicyclo[3.1.1]heptan-2-yl]ethyl}oxy)ethyl]-4-[(2-bromo-4,5-dimethoxyphenyl)methyl]-1,4-oxazinan-4-ium