4. When chromatography of a gas containing secondary amines, a peak with a retention time of 381 s was obtained in the chromatogram (liquid stationary phase squalane, column temperature 100 C). Under the same conditions, the retention times of n-heptane and n-octane are 348 and 372 s, respectively. The analyzed gas may contain di-iso-propylamine (Kovach retention index 644), di-n-proylamine (Kovach retention index 746), di-sec-butylamine (Kovach retention index 837). What amine is contained in the analyzed sample?
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