Materials composed of equidistantly stacked planar radicals can exhibit long range magnetic order. Often, such order is antiferromagnetic and present in semiconducting phases, although ferromagnetic and diamagnetic states have been observed. Our spin polarized calculations performed on a doubled unit cell of K3C6O6 predict the material to be diamagnetic (i.e., not magnetic). However, accurately predicting subtle magnetic couplings is challenging. While we consider more detailed analysis of magnetism to lie outside the scope of this work, we emphasize the need for careful characterization of such properties following the anticipated synthesis of these materials.