/usr/share/mimelnk/chemical/x-alchemy.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-alchemy
Comment=Alchemy Format
Comment[de]=Alchemy-Format
Comment[fr]=Format Alchemy
Icon=chemistry
Patterns=*.alc;
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