Purely organic ferromagnetic materials, which contains only light elements, have gained a great deal of interest because, in contrast to conventional ferromagnet, they show considerable advantages in technological applications such as lightweight, solubility in organic solvents, and transparency for photomagnetic switches and optical data storage. To date, the highest Tc=36K was achieved in a dithiadiazolyl radical (C8N3F4S2). We here propose a new metal-free organic ferromagnet and investigate its magnetic structure through neutron diffraction.