Figure 3 : MS-MS Mirror plot of elenolic acid glucoside (ESI-TOF/IT-MS) compared to four negative mode discriminatory features identified in our study (N2, N3, N4 and N5).

From: Ash leaf metabolomes reveal differences between trees tolerant and susceptible to ash dieback disease

Figure 3

The spectra share 4 peaks in common, m/z 179, 223, 371 and 403 (elenolic acid glucoside molecular ion). These fragments correspond to a loss of a methyl and hydroxyl group (403–371), loss of hexose (403–223) which is followed by a loss of CO2 (223–179). Elenolic acid corresponds to the secoiridoid part of oleuropein-related compounds suggesting that these four features are secoiridoids42. Figure from Sollars et al.19 extended data.