Search for "dipeptide isosteres" in Full Text gives 3 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2017, 13, 2637–2658, doi:10.3762/bjoc.13.262
Beilstein J. Org. Chem. 2014, 10, 544–598, doi:10.3762/bjoc.10.50
Beilstein J. Org. Chem. 2007, 3, No. 34, doi:10.1186/1860-5397-3-34