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. 2016 May 9;36:247–280. doi: 10.3767/003158516X691627

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© 2016 Naturalis Biodiversity Center & Centraalbureau voor Schimmelcultures

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Fig. 9 — Mass spectra of pulvilloric acid analyzed in ESI+ and ESI-. The intact [M-H]^- ion is observed in the negative electrospray ionization mode. The intact [M+H]⁺ ion is absent in positive electrospray ionization mode and the major ion species is [M-H₂O+H]⁺.