Tang, R. Z., Zhang, F., Fu, Y. B., Xu, Q., Wang, X. Y., Zhuang, X. D., et al. (2014). Efficient Approach to Electron-Deficient 1,2,7,8-Tetraazaperylene Derivatives. Organic Letters, 16(18), 4726-4729. doi:10.1021/ol502109y.