My first attempt at viewing molecular compounds. The .mol files I used are exported from molview.org. These contain the x,y,z coordinates of the atoms/bonds, atom type, and bond type. Click and drag the mouse to rotate.
Remix with "2-lines" drawing of covalent liaisons. Method is, for double bindings, to draw a thick black line, and then re-draw a "background average" (grey) line of smaller thickness just in the middle of it.