Figure 6
From: Isolation and purification of Cu-free methanobactin from Methylosinus trichosporiumOB3b

Negative ion ESI-MS spectrum of copper-bound methanobactin (m/z 1215.18).
From: Isolation and purification of Cu-free methanobactin from Methylosinus trichosporiumOB3b

Negative ion ESI-MS spectrum of copper-bound methanobactin (m/z 1215.18).