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Recently, the bond lengths of the molecular components of nucleic acids andof caffeine and related molecules were shown to be sums of the appropriatecovalent radii of the adjacent atoms. Thus, each atom was shown to have itsspecific contribution to the bond length. This enabled establishing theiratomic structures for the first time. In this work, the known bond lengths foramino acids and the peptide bond are similarly shown to be sums of the atomiccovalent radii. Based on this result, the atomic structures of all the twentyessential amino acids and a tripeptide have been presented.

Atomic Structures of all the Twenty Essential Amino Acids and a Tripeptide, with Bond Lengths as Sums of Atomic Covalent Radii