content: Hmmm.. let's see.. 6 rings, one in the center, 3 atoms on each outside ring... That has to be hexabenzocoronene!  Now let's see if I can find that image... Aha! I knew it! http://www.zurich.ibm.com/st/atomic_manipulation/pentacene.html (I'm a huge fibbing fibber. I found the image and the molecule name first. I have no idea what I'm looking at there, but their "microscope" sure looks cool.)