[2-[[4-[(2-chloro-4-nitrophenyl)azo]phenyl]ethylamino]ethyl](2-hydroxypropyl)dimethylammonium hydrogen sulphate

1-Propanaminium, N-[2-[[4-[(2-chloro-4-nitrophenyl) azo]phenyl]ethylamino]ethyl]-2-hydroxy-N ,N-dimethyl-, sulfate (1:1) (salt)