Why are there no chemical components for i-butane and i-pentane defined in the gas component analysis?

You enter the chemical composition data for a material or conversion group into the gas component analysis. However, there are no fields for i-butane (isobutane) and i-pentane (isopentane). Why?

i-butane and i-pentane are synonyms for the components 2-methylpropane and 2-methylbutane (the preferred IUPAC name), i.e. i-butane is 2-methylpropane and i-pentane is 2-methylbutane.

Some template conversion groups contain this mapping in the reading group parameter description, e.g. QVK0:

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