5,6-dichloro-1-ethyl-2-[2-(phenylamino)vinyl]-3-(3-sulphonatobutyl)-1H-benzimidazolium;4-[[5,6-Dichloro-1-ethyl-2-[2-(phenylamino)ethenyl]-1H-benzimidazol-3-ium]-3-yl]-2-butanesulfonate
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