The resistance encountered by the mobile phase when passing through the column.
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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
N4-(4-methylphenyl)-3,4-Pyridinediamine