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Extracted-ion chromatograms (KPA: m/z 165, ketopinic acid, IS (internal standards); IEPOX: m/z 173, two isomers; 2mGA: 321; 2-methylglyceric acid; 2MT: m/z 409, 2-methyltetrols, four isomers; mGAd: m/z 495, 2-methylglyceric acid dimer, three isomers) for non-acidic isoprene/NOx photooxidation experiments as a function of RH. Compounds were detected as silylated derivatives. For clarity of the figure, not all isomers are shown.
