Balaban, T. S., Goddard, R., Linke-Schaetzel, M., & Lehn, J.-M. (2003). 2-Aminopyrimidine directed self-assembly of zinc porphyrins containing bulky 3,5-di-tert-butylphenyl groups. Journal of the American Chemical Society, 125(14), 4233-4239. doi:10.1021/ja029548r.