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. 2021 Oct 9;18(20):10587. doi: 10.3390/ijerph182010587

Figure 3.

Figure 3

MS spectra of the (a) untreated and (b) treated pyrene; and of the (c) untreated and (d) treated 9-methylanthracene, both in the homogeneous ozonolysis experiments performed using acetonitrile as solvent. Green and blue rectangles indicate pyrene and 9-methylanthracene signals, respectively. * indicates unidentified structure.