In the context of SPPS, "orthogonal protection" refers to the use of protecting groups that are distinct from each other and can be selectively removed under specific conditions without affecting other protected functional groups. This selectivity is crucial when multiple reactive groups are present on the amino acids used in peptide synthesis.
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(S)-4-{[(S)-1-Allyloxycarbonyl-5-(2-chloro-benzyloxycarbonylamino)-pentylamino]-methyl}-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester
Boc-phaol
phenyl 3-O-acetyl-1-thio-β-D-mannopyranoside
