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