5-chloro-2-[2-[(5-chloro-3-ethyl-3H-benzoxazol-2-ylidene)methyl]but-1-enyl]-3-(3-sulphonatopropyl)benzoxazolium;3-[[5-Chloro-2-[2-[(5-chloro-3-ethylbenzoxazol-2(3H)-ylidene)methyl]-1-butenyl]benzoxazol-3-ium]-3-yl]-1-propanesulfonate
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