English: Schematic formula of trimethylene methane free radical (diradical). This drawing is meant to illustrate the "equilibrium" configuration, that is actually the average of three configurations that differ by 120 degree rotations. Formally, the radial bonds have valency 4/3, so each terminal carbon has 2/3 of an unfilled valence bond (that is 1 unfilled bond, 2/3 of the time)
Created ny J.Stolfi with a python script and a homemade SVG-writing module.
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