Keywords: Hexaoxotricyclobutabenzene-2D.png Structural formula of the hexaoxotricyclobutabenzene molecule C<sub>12</sub>O<sub>6</sub> Structure drawn in http //www cambridgesoft com/software/details/ ds 2 dsv 73 ChemDraw Ultra 11 0 Own 2009-06-29 Ben Mills Benjah-bmm27 Images by Ben Mills Hexaoxotricyclobutabenzene |