Targeted Delivery of Theranostic Agents

A compound of Formula (I):

• wherein
• R1 is a side chain of an amino acid selected from phenylalanine, 3-(1-naphthyl)alanine, 3-(2-naphthyl)alanine, or tyrosine, wherein the phenylalanine residue is optionally substituted with one or more halo, —NH2, cyano, C1-6alkyl, haloC1-6alkyl, or acetyl;
• R2 is selected from H or C1-C3alkyl;
• A is a radionuclide binding ligand;
• and
• -L- is an amino acid sequence:
• -D-Glu-D-Glu-D-Ala-D-Glu-D-Glu-D-Glu- (SEQ ID NO:
• 32;
• or
• a pharmaceutically acceptable salt thereof.