Missing Identifier data of n-alkanes

[JanLeppert]

Describe the bug
In the updated identifier files chemical identifiers pubchem large.tsv respectively chemical identifiers pubchem small.tsv
n-alkanes from methane (C1) to at least n-dotetracontane (C42) can not be found by there CAS numbers.

Additional context
I access these identifiers trough a Julia package ChemicalIdentifiers.jl. Locally on my computer I have an old copy of the databases, where the mentioned n-alkanes are found in the short database.