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

Figure 3.

Figure 3

Chemical structure and enhanced product ion mass spectrum of aeruginosamide AEG671 Pre+Phe+Phe+Pro+Pyr+TzlCOOMe identified based on the following fragment ions: 672 [M+H], 604 [M+H–Pre], 457 [M+H–(Pre+Phe)], 439 [M+H–(Pre+Phe)–H2O], 392 [Phe+Phe+Pro+H], 363 [Pre+Phe+Phe+H], 335 [Pre+Phe+Phe+H–CO], 310 [Pro+Pyr+TzlCOOMe+H], 295 [Phe+Phe+H], 267 [Phe+Phe+H–CO], 213 [Pyr+TzlCOOMe+H], 188 [Pre+Phe+H–CO], 144 [TzlOMe], 136 Tyr immonium ion, 120 Phe immonium ion; 112 TzlCO, 70 Pro immonium ion.