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Fmoc-Thr(tBu)-OH is the threonine derivative normally utilized in peptide synthesis with Fmoc amino acids. Like isoleucine, threonine has two chiral carbons. The threonine enantiomer allo-threonine is not common, but does occur in some peptides produced by bacteria. Threonine residues modified with phosphate or sugars play important biological functions. AAPPTec offers phosphothreonine and glycothreonine derivatives for solid phase peptide synthesis.