2-[2-[(3-ethyl-5-methylbenzothiazol-2(3H)-ylidene)methyl]but-1-enyl]-5,6-dimethyl-3-(3-sulphonatopropyl)benzothiazolium;2-[2-[(3-Ethyl-5-methylbenzothiazol-2(3H)-ylidene)methyl]-1-butenyl]-5,6-dimethyl-3-(3-sulfonatopropyl)benzothiazol-3-ium
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