A measure of how long an analyte is retained on the column relative to an unretained compound.
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Propanoic acid, 3-[3-hydroxy-2-(hydroxymethyl)-2-methyl-1-oxopropoxy]-2-[[3-hydroxy-2- (hydroxymethyl)-2-methyl-1-oxopropoxy]methyl]-2-methyl-, phenylmethyl ester
boronic acid, B-[3-(2,3-dihydro-3-methyl-1H-imidazol-1-yl)propyl]-, hydrobromide (1:1)