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. 2012 Mar 5;7(3):e32836. doi: 10.1371/journal.pone.0032836

Figure 1. Structures of the M. tuberculosis C29, C30 and C32 mycocerosic acid methyl esters.

Figure 1

The ions at m/z 452, 466 and 494 correspond to the molecular weights of these esters. Ions at m/z 88 and 101 are characteristic for 2-methyl branched fatty acid methyl esters, the former resulting from a well-known “McLafferty” rearrangement with transfer of one hydrogen atom.