We have significantly expanded our collection of amino acids. We offer a wide range of both proteinogenic and unnatural amino acids. Our diverse range of amino acids contains a variety of synthetically tractable functional groups enabling expedient synthetic strategies including protected amino acids for solid-phase peptide synthesis. Unnatural amino acids exploit the defined stereochemistry, amino and carboxylic acid functionalisation of a natural amino acid whilst incorporating one or two sidechains and allowing for a wide degree of functionalisation. Due to these properties unnatural amino acids are excellent starting points for complex synthesis, highly useful for SAR investigations and the incorporation into peptidomimetic drugs all make them highly valuable in medicinal chemistry. Please examine a sample of our amino acids. The full range of amino acids can be viewed by using our class search tool.