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. 2014 Nov 12;9(11):e113142. doi: 10.1371/journal.pone.0113142

Figure 4. Deconvoluted mass spectra of Δ2-boswellic acids as recorded in sample Q11: (a) Δ2-α-boswellic acid = oleana-2,12-dien-24-oic acid, (b) Δ2-β-boswellic acid = ursa-2,12-dien-24-oic acid, (c) Δ2,9(11)-β-boswellic acid = ursa-2,9(11),12-dien-24-oic acid and (d) 11-keto-Δ2-β-boswellic acid = 11-keto-ursa-2,12-dien-24-oic acid.

Figure 4

Abbreviations: m/z = mass to charge ratio, TMS = trimethylsilyl, rDA = retro-Diels-Alder, M = molecular ion.