Godbert, N., Batsanov, A., Bryce, M., & Howard, J. (2001). 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, 66(3), 713-719