Search for "nonplanarity" in Full Text gives 3 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2020, 16, 791–797, doi:10.3762/bjoc.16.72
Beilstein J. Org. Chem. 2018, 14, 1120–1180, doi:10.3762/bjoc.14.98
Beilstein J. Org. Chem. 2012, 8, 441–447, doi:10.3762/bjoc.8.50