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