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Ultrasmall gold nanoparticles (diameter about 2 nm) were surface‐functionalized with cysteine‐carrying precision macromolecules. These consisted of sequence‐defined oligo(amidoamine)s (OAAs) with either two or six cysteine molecules for binding to the gold surface and either with or without a PEG chain (3400 Da). They were characterized by 1H NMR spectroscopy, 1H NMR diffusion‐ordered spectroscopy...