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Analysis of α-823. (a) Base peak chromatogram of the 4.0–10.0 min portion with retention times and m/z [M+MH4]+ values. Data obtained with a partially purified extract of Actinoallomurus sp. ID145823 (see Table S1 and Figure S7 for the congeners comparison); (b) mass spectrometry (MS) at 8.1 min in positive (above) and negative (below) ionization mode; (c) MS2 analysis of m/z [M+NH4]+ 932; (d) putative fragmentation pathway for α-823.
