Godbert, N., Batsanov, A.S., Bryce, M.R., Howard, J.A.K., "Molecular saddles. 4. Redox-active cyclophanes by bridging the 9,10-bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene system: Synthesis, electrochemistry, and X-ray crystal structures of neutral species and a dication salt", Journal of Organic Chemistry, 2001