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. 2020 Aug 27;18(9):446. doi: 10.3390/md18090446

Figure 5.

Figure 5

Chemical structure and enhanced product ion mass spectrum of aeruginosamide AEG693 (Pre)2+Tyr+Val+Pro+Pyr+TzlCOOH identified based on the following fragment ions: 694 [M+H], 626 [M+H–Pre], 558 [M+H–(Pre)2], 477 [(Pre)2+Tyr+Val+Pro+H–H2O], 428 [Pre+Tyr+Val+Pro+H], 400 [Pre+Tyr+Val+Pro+H–CO], 370 [(Pre)2+Tyr+Val+H–CO], 331 [Pre+Tyr+Val+H], 303 [Pre+Tyr+Val+H–CO], 295 [Pro+Pyr+TzlCOOH+H], 272 [(Pre)2+Tyr+H–CO], 235 [Tyr+Val+H–CO], 204 [Pre+Tyr+H–CO], 199 [Pyr+TzlCOOH+H], 130 [TzlOH], 136 Tyr immonium ion, 112 TzlCO, 72 Val immonium ion, 70 Pro immonium ion.