Property has been proposed: https://www.wikidata.org/wiki/Wikidata:Property_proposal/MassBank_Accession_ID

Accession_to_InChi-Key.txt

This File contains a mapping of all Accessions with a Creative Commons License to InChi-Key. It was generated with the following bash script:

#!/bin/bash
for x in *; do
        if [ "$x" = "figure" ]; then
                continue
        fi
        # Literature_Specs have LICENSE: Unknown
        if [ "$x" = "Literature_Specs" ]; then
                continue
        fi
        if [ -d "$x" ]; then
                cd $x
                        grep -R  INCHIKEY * | awk -F: '{print $1 $3}' | awk  '{print $1" "$3}' | sed 's|.txt||g'
                cd ..
        fi
done

It will most likely contain more Accessions compared to the currently online ones, because I have accepted some new records this morning.

Thanks for the dump!
Re Literature specs, I created those myself by manually extracting literature data, @egonw just clarified that we are thus able to put a CC0 license on them as it was my work. Do you want to update these records with CC0 (or CC-BY for consistency?) so that we can include them as well? Likely quicker your end than mine ... ;-)

Since it's only identifiers, some even argue there is no data, and it cannot even be copyrighted.

But a quick note that I am free to enter the content of the text into Wikidata will do fine.