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

Figure 2.

Figure 2

Chemical structure and enhanced product ion mass spectrum of aeruginosamide AEG639 Pre+Tyr+Val+Pro+Pyr+TzlCOOMe identified based on the following fragment ions: 640 [M+H], 572 [M+H–Pre], 409 [Val+Pro+Pyr+TzlCOOMe], 391 [Val+Pro+Pyr+TzlCOOMe–H2O], 360 [Tyr+Val+Pro+H], 331 [Pre+Tyr+Val+H], 310 [Pro+Pyr+TzlCOOMe+H], 303 [Pre+Tyr+Val+H–CO], 263 [Tyr+Val+H], 235 [Tyr+Val+H–CO], 213 [Pyr+TzlCOOMe+H], 204 [Pre+Tyr+H–CO], 144 [TzlCOOMe], 136 Tyr immonium ion, 112 TzlCO, 72 Val immonium ion, 70 Pro immonium ion.