A dipeptide molecule (leucine-alanine) shown in 3-D


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A dipeptide is formed when two amino acids (in this case leucine and alanine) combine together. The -CONH- bond between the amino acid residues is called a peptide bond.

If the condensation process is repeated with one more amino-acid it will make a tripeptide, or if many amino-acids are combined the result is a polypeptide.

In each of these cases, there is an unattached amino group (-NH2) at one end as well as an unattached acid group (-COOH) at the other end of the chain of amino acid residues. These are called the N-terminus and the C-terminus.

Other options: Label the peptide bond atoms.

Highlight leucine residue

Highlight alanine residue
Label/ Unlabel atoms


You can move this molecule in 3 dimensions by holding down the left button and dragging using the mouse.

If you have a central mouse wheel you can usually zoom the image in/out.

Right clicking gives a variety of display options.

Simply leaving the mouse pointer over one of the atoms will give information about it; the atom symbol, and some other less useful numerical information.