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Nguyen et al.: Organic aerosol formation from the reactive uptake of IEPOX 3499 Zhang et al. (2012) and purifie with normal-phase column hydroperoxide (ISOPOOH), which has been documented to chromatography until the estimated purity based on nuclear yield mainly m/z 63 and a negligible amount of m/z 183 magnetic resonance (NMR) of the cis and trans β-IEPOX upon CID (Paulot et al., 2009b). ISOPOOH (m/z 203 → isomers are 99 % and > 92 %, respectively. Details of the syn- m/z 63), was not expected, nor observed, during IEPOX in- thesis and NMR spectra are reported in Bates et al.