Search for "dibenzotetraaza[14]annulene" in Full Text gives 2 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2019, 15, 617–622, doi:10.3762/bjoc.15.57
Beilstein J. Org. Chem. 2014, 10, 2175–2185, doi:10.3762/bjoc.10.225