Vilsboll T, Christensen M, Junker A, et al
In medicinal chemistry usage, unnatural amino acids typically include any amino-acid-like building blocks that are not among the standard genetically encoded set, including D-enantiomers, ,-disubstituted -amino acids, - and -amino acids, and amino acids bearing non-native functional groups (for example, boronic acids, fluorinated motifs, photoactive groups, or bioorthogonal handles)
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possible range = 012) and analysed as a continuous variable