Non-peptide bidentate ITAM mimics as ZAP-70 antagonists have been prepared by accommodating non-hydrolyzable phosphotyrosine analogues at each end of a non-peptide spacer with a maximal PP distance of 39 Å. The most potent antagonist 5 had an IC50= 0.25 μM against ZAP-70 with good cellular activity. Monodentates were ca. 10-fold weaker antagonists with improved cell permeability.