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Synthesis of imaging modules: 1a: R = NH2, 1b: R = OH; 2a: R = NH2, M1 = Gd (for MRI); 1b, 2b: R = OH, M1 = Gd; 2c: R = NH2, M1 = La (placeholder for PET); 3a: M1 = Gd, 3b: M = La (placeholder for PET)