Search for "pyrrolo[3,4-c]carbazole" in Full Text gives 2 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2021, 17, 2425–2432, doi:10.3762/bjoc.17.159
Beilstein J. Org. Chem. 2018, 14, 1619–1636, doi:10.3762/bjoc.14.138