SEARCH Articles Figures Tables Acids oxalic acid Eluent Eluents Eluents oxalic acid Eluents pyridine-2,6-dicarboxylic acid Oxalic acid Oxalic acid, acidity Oxalic acid/oxalate Pyridine 2,5-dicarboxylate Pyridine dicarboxylates Pyridines acidity Pyridines pyridine-3,5-dicarboxylate