2-[2-[(3-ethyl-5-methoxy-3H-benzoselenazol-2-ylidene)methyl]but-1-enyl]-6-methoxy-5-methyl-3-(4-sulphonatobutyl)benzothiazolium;2-[2-[(3-Ethyl-5-methoxybenzoselenazol-2(3H)-ylidene)methyl]-1-butenyl]-6-methoxy-5-methyl-3-(4-sulfonatobutyl)benzothiazol-3-ium
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