Displayed in the applet window is the molecule:
The fused aromatic rings are twisted out of planarity in order to fit the two fluorines. If the atoms are represented with van der Waal's radii, it's apparent that the rings have twisted just enough to allow the fluorines to touch. (Click “VDW radii”).
To rotate the molecule move the cursor inside the java frame
while holding down the (left) mouse button.
To access a pop-up menu use the right button on a PC or do a
control-click on a Mac while the cursor is inside the java frame.
To measure a bond distance, double-click on two atoms.
To measure a bond angle, do double-click, single-click, double-click
on three atoms.
To measure a torsion angle, do double-click, single-click, single-click,
double-click on four atoms.
