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Two-dimensional separation of phosphated tristyrylphenyl ethoxylates (a, Agnique PSE 16A, and b, Soprophor 3D33) and of tristyrylphenol ethoxylates (c, Agent 3152–90, and d, Termul 3150) using HPLC/a × m/UHPLC. Conditions reported in the chromatographic condition paragraph of the Experimental Section.
