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Chemical structure and enhanced ion product mass spectra of partially identified aeruginosin 21 with [M + H] ion at m/z 587 (N. spumigena KAC66). The mass signals were assigned to the following fragments: 569 [M + H − H2O], 527 [M + H − H2O − CH2N2], 429 [M + H − Argal], 411 [M + H − Argal − H2O], 308 [Choi-Argal + H − H2O − CH3N2], 291 [Choi-Argal + H − H2O − NH3], 266 [Choi-Argal + H − H2O − CH2N2], 140 Choi-immonium ion, 142 [Argal + H − NH3]. X—unknown part of the molecule.
