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In page Protein tertiary structure:

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The science of the tertiary structure of proteins has progressed from one of hypothesis to one of detailed definition. Although Emil Fischer had suggested proteins were made of polypeptide chains and amino acid side chains, it was Dorothy Maud Wrinch who incorporated geometry into the prediction of protein structures. Wrinch demonstrated this with the Cyclol model, the first prediction of the structure of a globular protein.[1] Under favorable conditions, such as confident knowledge of secondary structure, contemporary methods are sometimes able to predict the tertiary structure of small proteins (<120 residues) de novo to within 5 Å (0.5 nm).[citation needed]