1:45.8.0-3~deb8u1) is not available, but a newer one is (1:52.8.0-1~deb8u1). We redirected you there.
/usr/share/mimelnk/chemical/x-genbank.desktop is in chemical-mime-data 0.1.94-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | [Desktop Entry]
Encoding=UTF-8
Type=MimeType
MimeType=chemical/x-genbank
Comment=GenBank Flat File Format
Comment[de]=Flaches GenBank Dateiformat
Comment[fr]=Format de Fichier GenBank
Icon=chemistry
Patterns=*.gb;*.gen;
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