Figure A2.

Occurrence of monoglycosidic bGDGT Ib (1G-bGDGT Ib) at site C in Figure 1, which was determined by RP-ESI-MSⁿ. (A) The measured accurate masses of [M+H]⁺, [M+NH₄]⁺, [M+Na]⁺ adduct ions. (B) Extracted ion chromatogram of 1199.0739 (the theoretical mass of m/z [M+NH₄]⁺) ± 0.05. (C) MS² spectra of [M+NH₄]⁺ adduct ion (Note the ring location is based on Weijers et al., 2006).