Caffeic acid-pYEEIE

Phosphopeptide ligand for the src SH2 domain (IC50 = 42 nM) ; displays 30-fold higher affinity than N-acetyl-O-phosphono-Tyr-Glu-Glu-Ile-Glu (Ac-pYEEIE, ) .

C([C@@H](C(N[C@H](C(N[C@H](C(N[C@H](C(N[C@@H](CCC(O)=O)C(O)=O)=O)[C@H](CC)C)=O)CCC(O)=O)=O)CCC(O)=O)=O)NC(C=CC1=CC(O)=C(O)C=C1)=O)C2=CC=C(OP(=O)(O)O)C=C2