/usr/bin/cinnamon2d is in cinnamon 3.2.7-4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 | #!/bin/bash
CLUTTER_PAINT=disable-clipped-redraws:disable-culling LIBGL_ALWAYS_SOFTWARE=1 CINNAMON_SOFTWARE_RENDERING=1 CINNAMON_2D=1 CINNAMON_SLOWDOWN_FACTOR=0.0001 MUFFIN_NO_SHADOWS=1 CLUTTER_DEFAULT_FPS=15 cinnamon $@
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