Thirty-two aliphatic dicarboxylic acids were identified as methyl esters in the methylated diethyl ether extracts of four unifloral grade New Zealand rewarewa (Knightea excelsa) honeys using combined gas chromatography-mass spectrometry (GC-MS). 2- Methoxybutanedioic acid (0-methylmalic acid) and 4-hydroxy-3-methyl-trans-2-pentenedioic acid are proposed as floral marker substances for New Zealand rewarewa honey. The ...