/usr/share/mimelnk/ is in chemical-mime-data 0.1.94-6.
This file is owned by root:root, with mode 0o755.
..
/usr/share/mimelnk/chemical/
/usr/share/mimelnk/chemical/x-alchemy.desktop
/usr/share/mimelnk/chemical/x-cache.desktop
/usr/share/mimelnk/chemical/x-cactvs-ascii.desktop
/usr/share/mimelnk/chemical/x-cactvs-binary.desktop
/usr/share/mimelnk/chemical/x-cactvs-table.desktop
/usr/share/mimelnk/chemical/x-cdx.desktop
/usr/share/mimelnk/chemical/x-cdxml.desktop
/usr/share/mimelnk/chemical/x-chem3d.desktop
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/usr/share/mimelnk/chemical/x-cml.desktop
/usr/share/mimelnk/chemical/x-dmol.desktop
/usr/share/mimelnk/chemical/x-gamess-input.desktop
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/usr/share/mimelnk/chemical/x-gaussian-input.desktop
/usr/share/mimelnk/chemical/x-gaussian-log.desktop
/usr/share/mimelnk/chemical/x-genbank.desktop
/usr/share/mimelnk/chemical/x-gulp.desktop
/usr/share/mimelnk/chemical/x-hin.desktop
/usr/share/mimelnk/chemical/x-inchi-xml.desktop
/usr/share/mimelnk/chemical/x-inchi.desktop
/usr/share/mimelnk/chemical/x-jcamp-dx.desktop
/usr/share/mimelnk/chemical/x-macromodel-input.desktop
/usr/share/mimelnk/chemical/x-mdl-molfile.desktop
/usr/share/mimelnk/chemical/x-mdl-rdfile.desktop
/usr/share/mimelnk/chemical/x-mdl-rxnfile.desktop
/usr/share/mimelnk/chemical/x-mdl-tgf.desktop
/usr/share/mimelnk/chemical/x-mmcif.desktop
/usr/share/mimelnk/chemical/x-mol2.desktop
/usr/share/mimelnk/chemical/x-mopac-graph.desktop
/usr/share/mimelnk/chemical/x-mopac-out.desktop
/usr/share/mimelnk/chemical/x-msi-car.desktop
/usr/share/mimelnk/chemical/x-msi-hessian.desktop
/usr/share/mimelnk/chemical/x-msi-mdf.desktop
/usr/share/mimelnk/chemical/x-msi-msi.desktop
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/usr/share/mimelnk/chemical/x-ncbi-asn1.desktop
/usr/share/mimelnk/chemical/x-shelx.desktop
/usr/share/mimelnk/chemical/x-vmd.desktop
/usr/share/mimelnk/chemical/x-xyz.desktop