/usr/share/applications/screensavers/molecule.desktop is in xscreensaver-gl 5.30-1+deb8u2.
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 10 | [Desktop Entry]
Name=Molecule
Exec=/usr/lib/xscreensaver/molecule -root
TryExec=/usr/lib/xscreensaver/molecule
Comment=Draws several different representations of molecules. Some common molecules are built in, and it can also read PDB (Protein Data Bank) files as input. http://en.wikipedia.org/wiki/Protein_Data_Bank_%28file_format%29 Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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