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Positive ion mass spectrum of the UDP-N-acylmuramyl-l-Ala-d-Glu-DAP-d-Ala-d-Ala isolated from untreated M. tuberculosis. The m/z 808.2 ion represents MurNAc-l-Ala-d-Glu-DAP-d-Ala-d-Ala, and m/z 830.3 was the corresponding monosodium adduct. m/z 824.2 was identified as MurNGlyc-l-Ala-d-Glu-DAP-d-Ala-d-Ala. Ions corresponding to the mono- and disodium adducts (m/z 846.3 and m/z 868.2, respectively) were also observed.
