Figure 2.
Liquid chromatograms of 11 chemical reference substances chemical reference substances - retention time (min): 1 - 1.497, 2 - 1.665, 3 - 2.023, 4 - 2.16, 5 - 2.980, 6 - 3.348, 7 - 3.774, 8 - 5.506, 9 - 7.164, 10 - 7.450 and 11 - 8.561
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