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Table 1 Characteristic fragment ions and corresponding m/z values of dehydroabietic acid (DHA) and 7-oxo-dehydroabietic acid (7-oxo-DHA) as methyl esters

From: Characterization and Identification of Natural Terpenic Resins employed in “Madonna con Bambino e Angeli” by Antonello da Messina using Gas Chromatography–Mass Spectrometry

Ion DHA 7-oxo-DHA
M 314 328
[M - CH3]+ 299 313
[M - COOCH3]+ 255 269
[M - HCOOCH3]+   268
[M - CH3HCOOCH3]+ 239 253