4-(4-Diethylaminophenylazo)-1-(4-nitrobenzyl)pyridinium (bromide)
https://www.dnaperfection.com/shop/cell25sk30509-4-4-diethylaminophenylazo-1-4-nitrobenzyl-pyridinium-bromide-64119
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4-(4-Diethylaminophenylazo)-1-(4-nitrobenzyl)pyridinium bromide is a very stable compound that can be used in the determination of anionic surfactants.
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