/usr/share/applications/cain.desktop is in cain 1.9-7.
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]
Name=Cain
Comment=simulations of chemical reactions
Exec=/usr/bin/cain
Icon=/usr/share/cain/gui/icons/cain.png
Terminal=false
Type=Application
Categories=Development;Science;Biology;
StartupNotify=true
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