Figure 4.

Extracted ion chromatogram (EIC) at m/z 895, full scan spectrum (MS1) at 8.92 min, fragmentation mass spectrum (MS2) and proposed structure of the new AP 894 with [M + H]⁺ at m/z 895. (m/z 749 = [M + H − Lys]⁺, m/z 723 = [M + H − Lys − CO]⁺, m/z 705 = [Lys-Leu/Ile-Hty-MeHty-Lue/Ile − H₂O + H]⁺ or [M + H − Lys − CO − H₂O]⁺, m/z 636 = [CO-Lys-Leu/Ile-Hty-MeHty]⁺, m/z 608 = [Lys-Leu/Ile-Hty-MeHty]⁺, m/z 530 = [Leu/Ile-Lys-Leu/Ile-Hty]⁺, m/z 482 = [Leu/Ile-Hty-MeHty + H]⁺, m/z 369 = [Hty-MeHty + H]⁺, m/z 305 = [MeHty-Leu/Ile + H]⁺, m/z 240 = [Lys-Leu/Ile + H]⁺, m/z 164 = MeHty immonium ion, m/z 107 = Hty related ion, m/z 84 = Lys immonium ion).