2-[2-[[5,6-dimethoxy-3-(3-sulphonatopropyl)-3H-benzoselenazol-2-ylidene]methyl]but-1-enyl]-3-ethyl-5-methoxybenzoxazolium;2-[2-[[5,6-Dimethoxy-3-(3-sulfonatopropyl)benzoselenazol-2(3H)-ylidene]methyl]-1-butenyl]-3-ethyl-5-methoxybenzoxazolium
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