Search for "tetralactam macrocycles" in Full Text gives 3 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2019, 15, 1460–1467, doi:10.3762/bjoc.15.146
Beilstein J. Org. Chem. 2019, 15, 1086–1095, doi:10.3762/bjoc.15.105
Beilstein J. Org. Chem. 2012, 8, 234–245, doi:10.3762/bjoc.8.24